Flashcard Set Preview
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| 1 |
Terrestrial Planets
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the 4 inner planets that're small, dense & have rocky surfaces
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| 2 |
What does "terra" mean in latin?
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earth
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| 3 |
What're Earth's 3 main layers?
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the crust, mantle & core
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| 4 |
Earth's Crust
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Earth's rocky, solid surface
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Earth's mantle
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a layer of hot molten rock
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| 6 |
Earth's Core
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a dense core made mostly of iron & nickel
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| 7 |
About how much of Earth is covered in water?
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70%
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| 8 |
What on Earth allows it to have an atmosphere?
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Earth's gravity
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| 9 |
What does Earth's atmosphere consist of?
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about 20% oxygen & the rest mostly nitrogen
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| 10 |
What terrestrial planet is the smallest & closest to the sun?
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Mercury
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| 11 |
What planets have no moons?
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Venus & Mercury are the only planets in the Solar System that have no moons
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| 12 |
What is Mercury mostly made of?
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dense metal iron
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| 13 |
What probe gave astronomers most of their knowledge about Mercury?
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Mariner 10
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| 14 |
What does Mercury have on its surface?
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many flat plains & craters
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| 15 |
Does Mercury have an atmosphere?
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it barely has one; small amounts of sodium & other gases have been detected around Mercury
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