One third of the earth's surface is desert.
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The sea covers nearly three-fourths of the earth's surface.
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Although rainforests make up only two percent of the earth's surface, over half the world's wild plant, animal and insect species live there.
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But the earth's magnetic field is very weak.
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Pigeons can find their way home with the help of the Earth's magnetic field.
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So the pigeon can feel the magnetic field on its head, but it can't feel the Earth's magnetic field.
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This may be because they could not use the earth's magnetic field.
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The magnetite is attracted to the earth's magnetic field.
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The moon is the earth's only satellite.
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The moon is the Earth's satellite.
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Now, one and a half billion more human beings can live on the earth's surface, supporting themselves by working for others.
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We have used earth's energy resources as if they were limitless.
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Water makes up most of the earth's surface.
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The earth's ecosystem is to some extent self-correcting, so it is also possible that the effects are being masked by other changes.
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Three-fourths of the earth's surface is water.
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One fifth of the earth's surface is covered by permafrost.
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About one third of the earth's surface is land.
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Two-thirds of the earth's surface is covered with water.
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Three-fourths of the earth's surface is covered with water.
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About three fourths of the earth's surface consists of water.
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Goods are the great travelers over the earth's surface, far more than humans, which means that hardly an inhabited spot on the globe is untouched by trade.
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Land and water make up the earth's surface.
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Land occupies the minor portion of the earth's surface.
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Among the people of the colonies suffering under Earth's tyranny a force emerges intending to overthrow the status quo through terrorism.
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I'm saying "For the sake of Earth's environment," but actually it's "For the sake of the people living on Earth."
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The asteroid broke up into small pieces as it entered Earth's atmosphere.
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One-fifth of the Earth's surface is covered by permafrost.
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Permafrost covers one-fifth of the Earth's surface.
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The Earth's climate is fragile.
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Forests cover around 9.4% of the earth's surface.
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The earth's moon is a natural satellite.
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Harnessing electricity, said the man with the bongos, is a sinful perversion of the earth's resources.
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The Moon is the Earth's only satellite.
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Three fourths of the earth's surface is covered with water.
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Flowers are the earth's smile.
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The surface of the Dead Sea is about 400 meters below sea level, earth's lowest elevation on land.
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The surface of Jupiter is inhospitable with more than two and a half times Earth's gravity and a poisonous gas atmosphere.
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The Martian red desert stretched beyond and around me as I was wearing a spacesuit with oxygen tanks. The air outside was thinner, of course, than the Earth's. There was some breeze that would otherwise blow tumbleweeds on Earth's own deserts.
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The Martian red desert stretched beyond and around me as I was wearing a spacesuit with oxygen tanks. The air outside was thinner, of course, than the Earth's. There was some breeze that would otherwise blow tumbleweeds on Earth's own deserts.
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The surface gravity on Mars is more than a third of Earth's.
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Humanity is rapidly destroying the Earth's environment.
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Mars' equatorial radius is a factor of 0.533 of Earth's.
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The mean radius of Saturn's moon Titan is a factor of 0.404 of Earth's.
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Titan's surface pressure is 146.7 kPa, whilst Earth's is 101.325 kPa.
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Person of the future: "The calendar of this Unix machine that the ancients built only goes up to January 19, 2038. As such, I am convinced that this marks the day of the Earth's destruction."
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For a start, we have a very incomplete knowledge of the earth's biota.
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Earth's moon is a natural satellite.
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The weight of aluminium in the Earth's crust corresponds to 8.13% of the total weight.
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Siberia is one of the earth's "green lungs".
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Mars's gravity is 38% of Earth's gravity.
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It's the 11th most common element in the Earth's crust in fact.
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Earth's population will soon double.
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Sodium is one of the most abundant elements in the Earth's crust.
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Days get longer by about 1.7 millisecond per century because the moon is slowing the Earth's rotation.
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Most scientists now agree that Chicxulub contains evidence that a huge asteroid or comet crashed into Earth's surface, causing the extinction of more than 70 percent of the living species on the planet, including the dinosaurs.
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Earth's gravity isn't uniform.
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Venus has a retrograde rotation which means it rotates on its axis in the opposite direction from the Earth's rotation. This causes the Sun to rise in the west and move eastward across the sky.
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The Earth's axis is not straight up and down, but tilted a little bit. This tilt is responsible for us having seasons. Otherwise, the temperature would be pretty much the same all year long.
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The Earth's atmosphere contains water vapor which helps to moderate our daily temperatures.
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Due to the friction generated between a meteor and the atmospheric gases, most meteors burn up before hitting Earth's surface as a meteorite.
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The Earth's magnetic field traps the charged particles which are hurled at the Earth by the Sun during solar wind activity. When these charged particles react with the gases in our atmosphere, the gases begin to glow. These aurorae, or glowing gases, are seen in the Arctic Circle and the Antarctic Circle.
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The rapid spin of the Earth along with the molten metallic core produces the Earth's magnetic field.
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Astronomers estimate Jupiter's core temperature at 20,000 degrees Celsius, approximately three times greater than the temperature of the Earth's core.
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If a meteoroid falls into the Earth's atmosphere, it will begin to heat up and start to glow. This is called a meteor.
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On July 11, 1979, after more than six years in space, the Skylab space station re-entered the Earth's atmosphere. Most of Skylab burned up upon re-entry. A few fragments fell to the ground in an uninhabited part of Australia.
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Most of the station disintegrated as it fell through Earth's atmosphere.
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Tycho Brahe proved that comets were not just components of Earth's atmosphere, but actual objects traveling through space.
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Dr. Carl Sagan helped design the plaques carried by both Pioneer 10 and Pioneer 11. These plaques, bearing the images of a man and a woman as well as a diagram showing Earth's location in the Galaxy, may one day be found by an extraterrestrial civilization.
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Sometimes, the Moon passes between the Earth and the Sun. The Moon blocks the light of the Sun and a shadow of the Moon is cast on the Earth's surface. This is an eclipse of the Sun, or a solar eclipse.
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A total eclipse is only visible from a narrow strip (about 150 km wide) of the Earth's surface at any one time.
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Aliens controlled Earth's progress in secret.
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What's Earth's color?
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The civilization of planet Arratellia is superior to Earth's.
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Rainforests are one of the Earth's greatest biological treasures.
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At the equator, Earth's surface is rotating at 1675 kilometers per hour!
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If we launch the rocket toward the east, it will get a big boost from Earth's rotational motion.
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What if Earth's atmosphere started to behave like a too-hot greenhouse? We cannot open Earth's windows or doors to cool it off.
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What if Earth's atmosphere started to behave like a too-hot greenhouse? We cannot open Earth's windows or doors to cool it off.
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Magma can rise when pieces of Earth's crust called tectonic plates slowly move away from each other. The magma rises up to fill in the space.
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The planet is warming up fast—faster than at any time scientists know about from their studies of Earth's entire history.
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Carbon dioxide is a greenhouse gas. That means it traps heat from Earth's surface and holds the heat in the atmosphere.
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Scientists have learned that, throughout Earth's history, temperature and CO2 levels in the air are closely tied.
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The ocean covers 70% of Earth's surface.
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The top few meters of the ocean store as much heat as Earth's entire atmosphere.
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The Earth's cryosphere (the frozen water on our planet) currently covers about 10% of the Earth's surface.
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The Earth's cryosphere (the frozen water on our planet) currently covers about 10% of the Earth's surface.
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Just 3.5 percent of Earth's water is fresh.
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Over 68 percent of Earth's freshwater is locked up in ice and glaciers; and another 30 percent is in groundwater.
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About two-thirds of the Earth's oxygen is produced by phytoplankton.
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A third of the earth's surface is desert.
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No one wished it so, but we are the first species to become a geophysical force, altering Earth's climate, a role previously reserved for tectonics, sun flares, and glacial cycles.
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It is generally thought that the earth's water came from collisions with comets.
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Earth's equator is parallel to the Tropic of Capricorn and the Tropic of Cancer.
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Venus is Earth's twin by size, but its dense atmosphere is made up mostly of carbon dioxide, which helps keep the planet sizzling hot. Venus, therefore, is not hospitable for life.
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Comet Halley is responsible for depositing the debris that, when falling through Earth's atmosphere, causes the Orionid meteor showers.
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In 1991, Mt. Pinatubo's volcanic outburst in the Philippines produced the second largest eruption of the 20th century. Ash from the blast was ejected as high as 21 miles above Earth. Particles from the eruption created a layer of sulfuric acid haze in Earth's atmosphere, dropping global temperatures by nearly 1 degree Fahrenheit between 1991 and 1993.
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Rivers are plentiful on Earth, and each river has a connection of streams that all flow into it. Some of Earth's solar-system neighbors show evidence that they once had similar river systems.
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Earth's polar ice caps consist of water ice. Mars's polar caps, however, are a combination of water ice and carbon-dioxide ice.
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Earth's surface is covered mostly by water.
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We can't see other stars during the day because the sun's light illuminates Earth's atmosphere.
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Meteors are the bright flashes of light seen in the night sky. They are caused by meteoroids — small, solid objects moving through space that have entered Earth's atmosphere.
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