RMK22EAC–In this second most common reactor, boiling occurs directly in the reactor core; it is used mainly in the United States, Sweden and Japan.
RMK22E9N–Those are some symbols used in mathematics.
RMK22E9H–Decimal system established by the 11th General Conference on Weights and Measures (GCWM) in 1960 and used by many countries.
RMK22EA0–Geometric shapes in three dimensions that are delimited by surfaces.
RMK22EA1–Device with a turbine that transmits the water's mechanical energy to the generator's rotor to make it turn to produce electricity.
RMK22EAY–The Earth is formed of three concentric layers: the core, the mantle and the crust; these are separated by transition zones called discontinuities.
RMK22EA5–Formed of mounds of earth or rocks, it is used mainly when the subsoil does not allow for construction of a concrete dam.
RMK22E9Y–Those are some polygons, which are geometric plane figures with several sides and a number of equal angles.
RMK22EB2–Natural flow of water that varies in size, depending on the ground slope and the number of tributaries.
RMK22EA9–Developed for the most part in Great Britain and France, it was replaced by the pressurized water reactor, which performs better and is less expensive.
RMK22E9G–Those are some symbols used in biology.
RMK22E9E–Optical instrument mounted on a rifle or a measuring device to increase accuracy.
RMK22EAD–The skateboarder uses a board mounted on small wheels.
RMK22EA6–Its curvature allows most of the water's thrust to be transmitted to the usually narrow valley slopes supporting it.
RMK22EAE–All the mechanisms of cell division that allow the formation of two identical daughter cells from a mother cell.
RMK22EA3–Used mainly in wide valleys, it consists of an impermeable wall, which is shored up by a series of buttresses to transmit the thrust of the water to the foundation.
RMK22E9M–Those are some symbols used in geometry.
RMK22E9W–Those are some polygons, which are geometric plane figures with several sides and a number of equal angles.
RMK22E9P–Those are some symbols used in mathematics.
RMK22E9R–Those are some polygons, which are geometric plane figures with several sides and a number of equal angles.
RMK22EAA–The advantage of this type of reactor is that it does not require fuel enrichment; it is used mainly in Canada, Argentina and India.
RMK22EA7–Its huge mass resists the thrust of the water to prevent it from overturning or sliding; this type of dam is usually used to hold back large volumes of water.
RMK22ECG–In this second most common reactor, boiling occurs directly in the reactor core; it is used mainly in the United States, Sweden and Japan.
RMK22EBW–Refining of crude oil yields hundreds of useful products.
RMK22E9K–Uppercase letters that represented numbers in ancient Rome; they are still seen today in uses such as clock and watch dials and pagination.
RMK22E9J–Decimal system established by the 11th General Conference on Weights and Measures (GCWM) in 1960 and used by many countries.
RMK22E9B–Radioactive elements that are abundant in nature (elements 89 to 92) or made artificially (elements 93 to 103). Most of them have no industrial applications.
RMK22CWY–The Earth is formed of three concentric layers: the core, the mantle and the crust; these are separated by transition zones called discontinuities.
RMK22E8J–Excavation machine for pushing materials; it is made up of a crawler tractor, a blade and often a ripper.
RMK22D24–Magma that rises toward Earth’s surface accumulates in gigantic magmatic chambers. If the molten rock is not ejected by a volcanic eruption, it raises the rocky strata on the surface into dome shapes.
RMK22DWT–A plane equipped with meteorological instruments enters the eye of the cyclone to drop a probe that will gather precise data on the cyclone’s behavior.
RMK22D5G–Vegetation: all plants growing on the surface of the Earth, varying according to the climate and the characteristics of the soil.
RMK22E97–Usually less reactive than alkali metals and alkaline earth metals but very good electric and thermal conductors. Many of these metals form vital alloys.
RMK22DH4–Map that represents the boundaries and in some cases the subdivisions of political units (as countries or states)
RMK22B03–From above, the Milky Way appears as a spiral that rotates on itself around a nucleus.
RMK22D7M–The water flowing on Earth’s surface usually moves toward sea. If an obstacle or hollow prevents water from following its course,it may form a basin. As water continues to collect,a lake created. Most lakes are freshwater contain only small amounts mineral salts. There are,however,some saltwater lakes. Some contain large amounts salt because nearby ocean water has managed to seep into them. Other lakes,such as those found in middle deserts,are extremely salty. This because their waters are constantly evaporating under Sun,leaving behind a high concentration minerals in remaining water.
RMK22CPF–Unlike the geographic North Pole, which is stationary, the magnetic North Pole moves about 10 to 15 km northwest per year. This movement is probably explained by a fluctuation in the strength and orientation of the magnetic field.
RMK22DF6–A region, usually characterized by heat, where aridity (less than 4 in of annual rainfall) is such that plant and animal life is scarce.
RMK22D8W–System formed by the mouth, the digestive tract and its glands that uses mechanical action, enzymes or secretions to break down food, absorb nutrients and expel waste.
RMK22E8A–Article of jewelry used to fasten and adorn a garment.
RMK22E82–Cutting a gemstone consists of angling the facets so that the stone's brilliance is intensified
RMK22C9K–Large currents water flow through world's oceans,taking precise routes. Currents that circulate on water’s surface are pushed by Earth’s prevailing winds can travel more than 30 miles (50 km) a day. If currents begin in tropical zones,their waters are warm; if they start off near poles,they are cold. Deep currents are formed under polar ice floes,which are large sheets floating ice.
RMK22E84–Next to precious stones, these stones are the ones whose beauty and durability make them most suitable for jewelry.
RMK22DK0–Plants are the most threatened in the regions of the intertropical zone. Although biodiversity in these zones is high, the number of individuals of a given species is often relatively low. Certain species of trees in the rainforest have only one representative per hectare, and they are thus more vulnerable. In addition, many tropical plants are endemic—that is, they grow only in a particular region of the planet. The degradation of tropical ecosystems may lead to the complete extinction of the endemic species that they are home to.
RMK22DH5–The continents are vast tracts of land surrounded by water; they cover about 30% of the Earth's surface.
RMK22E8F–Group of stringed instruments played with a bow.
RMK22CY0–Jets of steam and water spring from the ground, sometimes to a height of more than 100 m. The highest active geyser, the Steamboat, whose jet skyrockets over 110 meters, is in Yellowstone National Park. Early in the 20th century, Wainangu, a geyser in New Zealand, sent water more than 450 meters into the air.
RMK22E7P–Article of jewelry worn on the earlobe.
RMK22C9D–We may live on land,but we cannot survive without ocean. water covering most our planet helps create air we breathe. Millions tiny plants that live in ocean produce precious gas in air,which we call oxygen. ocean also works to keep our climate comfortable. Its cold warm currents travel globe,heating cooling entire countries. Huge amounts water on its surface are constantly evaporating,then fall as rain or snow over other parts world. Acting like a giant heat reservoir,ocean even collects Sun’s excess rays,preventing tropics from burning up! Deep beneath ocean’s surface a hidden universe.
RMK22E80–The most common cut for a diamond is the brilliant cut; it consists of 58 facets spread over two faces, which are separated by a girdle.
RMK22DF5–A region, usually characterized by heat, where aridity (less than 4 in of annual rainfall) is such that plant and animal life is scarce.
RMK22D88–Gently rounded or capped by tall peaks,mountains are planet’s most striking showpieces. They are also Earth’s highest land features. Many these massive,often steep formations are located along edges continents. They may form chains,or ranges,that extend for thousands miles (or kilometers). principal mountain ranges include Rocky Mountains Andes,which run from North America all way down through South America
RMK22E7E–Canadian-built Earth observation satellite used to monitor environmental changes and natural resource use.
RMK22D6P–The installations and instruments required to conduct meteorological observations on the ground.
RMK22DPC–Above each of Earth’s hemispheres are three loops of atmospheric circulation: the polar cell, the Ferrel cell, and the Hadley cell. These loops are composed of ascending and descending movements, caused by the pressure gradient, and horizontal movements, caused by the Coriolis force. In each circuit, the warm air rises, moves at high altitude, descends again as it cools, then is warmed again as it moves on the surface in a constant direction.
RMK22E11–Many kinds of winds blow in every part of the world. These winds can be gentle, warm, cold, dry, humid, or full of dust. Here are the names given to some of them: Chinook, Chocolatero, Barber, Mistral, Sirocco, Foehn, Monsoon and Buran.
RMK22DJB–A region, usually characterized by heat, where aridity (less than 4 in of annual rainfall) is such that plant and animal life is scarce.
RMK22DXH–The Doppler effect is a physical phenomenon that changes the frequency of waves perceived by an observer as a function of the movement of the source. The Doppler radar uses this characteristic to evaluate the direction in which a cloud is moving. If the frequency received is higher than the frequency emitted, the target is getting closer to the antenna. If it is lower, the target is moving away.
RMK22E96–Usually less reactive than alkali metals and alkaline earth metals but very good electric and thermal conductors. Many of these metals form vital alloys.
RMK22CXC–Craters more than 1 km in diameter are called calderas. Formed when the top of a volcanic cone collapses, they may be up to 60 km in diameter. During an eruption, magma is ejected from the magma chamber via the central vent and secondary vents. The vents are gradually emptied. The central part of the volcano can no longer support the weight of the volcanic cone and the top collapses. The cone’s material covers the bottom of the caldera, which has very steep sides. Some calderas fill with water and form lakes.
RMK22DGH–Landform built up as lava and ash are ejected from the upper mantle during successive eruptions, accumulating and solidifying on the surface.
RMK22D86–Vast expanse of forest composed mainly of conifers, although certain deciduous trees also grow here.
RMK22DKP–The sterilization of its soil is the result of a half century of intensive agriculture. Traditionally, the periodic monsoon rains ensured wild vegetation in the region, and this protected the land from the Sun’s heat and returned humidity to the atmosphere, thus contributing to the water cycle. In cultivated fields, on the other hand, solar rays are absorbed directly by the soil, causing it to dry out.
RMK22D58–Climate is a collective term for the atmospheric conditions (temperature, humidity, air pressure, wind, precipitation) that characterize a given region.
RMK22D57–Spacecraft placed in orbit around the Earth, emitting signals to receivers on the ground.
RMK22E85–The value of these four gemstones is based on their rarity, brilliance and durability.
RMK22D6K–Telescope composed of two mirrors mounted on a shared base.
RMK22D59–Scientific method that makes it possible to forecast atmospheric conditions in a particular region for a given period.
RMK22EAB–The most common type of reactor in the world; water from the coolant is kept under heavy pressure to prevent it from vaporizing.
RMK22CP0–Five billion years ago, the Solar System did not exist. There was only a huge diffuse cloud of dust and gases turning slowly on itself. Over time, the Sun was formed, followed by the nine planets, including Earth, which formed like a snowball, by the agglomeration of matter around the original nebula.
RMK22E8C–Small pieces of costume jewelry attached to a chain or a bracelet.
RMK22CPK–Unlike the geographic North Pole, which is stationary, the magnetic North Pole moves about 10 to 15 km northwest per year. This movement is probably explained by a fluctuation in the strength and orientation of the magnetic field.
RMK22D5J–A number of interactions that cause oxygen and carbon, two elements essential to life, to circulate through the biosphere.
RMK22E7Y–Article of jewelry worn around the neck that consists of a band of gold or silver, a circle of set or unset precious stones or pearls strung together.
RMK22DWP–When a disturbance becomes organized around a low-pressure zone where winds are blowing at between 37 and 62 km/h, it is called a tropical depression. The depression develops into a tropical storm: the low pressure deepens, while winds rise to between 63 and 117 km/h. A tropical storm becomes a cyclone when wind speeds are above 118 km/h. In the eye that forms at the center of the cloud mass, the pressure drops to below 980 hPa. Deprived of its main source of energy, warm water, the cyclone weakens very quickly. The dissipation stage starts just a few hours after it travels inland.
RMK22E9C–Thicker in the center than on the edges; they cause parallel light rays emanating from an object to converge onto the same point.
RMK22AYJ–The only part of the shuttle to fly in orbit; can transport 13 tons of material and five to seven astronauts.
RMK22CEX–Usually made with a simple ballpoint pen, it is fixed to the desk or counter.
RMK22DW3–Sometimes, two reflections occur within a single raindrop. A secondary rainbow, less sharply defined and with the colors in reverse order, then appears over the first one.
RMK22D5P–Water used in various human activities becomes loaded with many organic and chemical residues. This wastewater, which is often harmful to the environment, can have a disastrous effect if it is not properly treated before being released. It must undergo a complex purification process to keep it from polluting the natural environment.
RMK22CHF–Mechanisms consisting of toothed parts that mesh to transmit the rotational motion of the shafts they are a part of.
RMK22DNF–The Earth is formed of three concentric layers: the core, the mantle and the crust; these are separated by transition zones called discontinuities.
RMK22E88–Flexible article of jewelry worn on the wrist, the arm or sometimes the ankle.
RMK22E99–Family of chemical elements also called inert, as they are weakly reactive.
RMK22CXD–Most volcanoes emerge in strings along the edges of lithospheric plates. One of the best-known volcanic regions is the circum-Pacific belt, which contains many of the world’s volcanoes. Arranged in an island arc stretching across the Pacific Ocean, the belt includes the volcanic archipelagos of the Aleutians, Japan, Indonesia, and the Philippines.
RMK22AX3–From the side, the Milky Way appears as a disk because its spiral arms are seen from the same angle.
RMK22D54–Western end of the vast Eurasian supercontinent, separated from Asia, according to convention, by the Ural Mountains. It represents 7% of dry land on Earth.
RMK22E87–Article of jewelry worn on the finger; it might have symbolic significance.
RMK22E93–These elements are not part of any other category of metal; they are sometimes called posttransition metals.
RMK22DY9–La Niña W brings a general cooling of the atmosphere, particularly in the Far East, western Africa, and western Canada. The southeastern United States, in contrast, gets much warmer and has more frequent hurricanes. The rain intensifies in the western Pacific, Amazonia, and southeast Africa, but becomes scarcer on the Pacific coast of South America.
RMK22C9F–Earth’s crust is entirely made up of different kinds of rocks. Although they may appear solid and indestructible, rocks change continuously over time, forming, deforming, and transforming into other kinds.of rock. They may be pushed deep inside the planet only to resurface later on. In this way, rocks are recycled by nature, in a complex process that may last millions of years. Some rocks, like the very first ones that appeared on Earth, were formed from magma, a fiery liquid rock buried in the planet’s mantle. Some formed out of other kinds of rocks that already existed.
RMK22DR7–Most of the tornadoes in North America occur in the central United States, in a “tornado belt” comprising the states of Texas, Oklahoma, Kansas, and Nebraska. In this region, the combination of warm winds from the Gulf of Mexico and cold winds from Canada creates ideal conditions for the formation of mesocyclones, especially in April and May. In the southeastern part of the continent (Florida, Alabama, Louisiana, Mississippi), tornado season occurs earlier, between January and March. The western United States, protected by the Rocky Mountains, is practically tornado-free.
RMK22DEK–Landform built up as lava and ash are ejected from the upper mantle during successive eruptions, accumulating and solidifying on the surface.
RMK22DW8–The life cycle a thunderstorm cell has three stages. In development stage,updraft a humid air mass forms a cumulus cloud. If air unstable,warm currents continue to rise,cloud grows to cumulonimbus stage. When it reaches tropopause,cloud stops developing in height becomes loaded with ice crystals that begin precipitation process. thunderstorm then enters its maturity stage: cold,heavy air from top cloud suddenly falls in form strong currents accompanied by lightning heavy showers.
RMK22BFX–Earth’s annual trajectory passes 12 of these constellations. This path through the heavens is called the Zodiac, and the Moon, the Sun, and the planets seem to move along it. The constellations are never more than 40 ̊ from the celestial equator. Depending on the time of year, different constellations are visible at night from Earth. In March, for instance, we can see the constellations of Leo and Virgo .
RMK22CXF–Hot spots in the ocean create characteristic lines of volcanic islands. When magma rises to the surface, it breaks through the oceanic plate and produces a volcano. The plate moves, but the hot spot stays still. Therefore, it stops feeding the first volcanic structure and creates a new volcano. The extinguished volcano slowly erodes and coral reefs grow on its slopes, forming an atoll—a ring- shaped island around a shallow stretch of water called a lagoon. The eroded volcano, which has sunk below the surface, is called a guyot.
RMK22DG8–Earth’s atmosphere is made up of layers. The lowest ones (troposphere, stratosphere, mesosphere) have a relatively homogeneous composition but widely varying temperatures. In the thermosphere (80–500 km altitude), the temperature rises considerably, since this layer absorbs considerable solar radiation. Above it is the exosphere, a zone where the few remaining molecules of air escape Earth’s gravity.
RMK22E9D–Thicker on the edges than in the center; they cause parallel light rays emanating from an object to diverge.
RMK22E2K–Invented more than 2,000 years ago, gears are combinations of several wheels with teeth.The teeth of one wheel fit into the teeth of another wheel. As the first wheel turns, it transfers its motion or power to the next wheel, and so on. Gears today are used in many different devices, including door handles, locks, bicycles, clocks, and watches.
RMK22D53–Continent located primarily in the southern hemisphere, between Central America and Cape Horn. It Represents 12% of dry land on Earth.
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