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| ______ is the planet that is most like the Earth in diameter and mass. |
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Differentiation of the core from the mantle early in Earth’s history was possible because the planet was
____________ at the time. |
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| The four outer (giant) planets are composed largely of _______. |
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The stream of charged particles given off by the Sun, which disallowed the accumulation of hydrogen
and helium in terrestrial planet formation, is called ____________. |
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| The Moon's low average density tells us that the interior contains relatively little _______. |
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| This star provides the energy that drives Earth's external heat engine. |
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| Heat left over from this planetary formation process along with radioactive decay, drives the Earth's internal heat engine. |
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| In our current understanding of the Big Bang, ____________. |
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| Universe considerably older than Earth |
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| ____ is the largest planet in both radius and mass. |
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| To measure vast distances in the solar system, astronomers use the ____, the Earth's average distance from the Sun. |
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| As planetismals struck the growing Earth, their impact energy in combination with ______ melted the planet. |
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| ____ are small, planetlike bodies. |
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| The Big Bang theory states that ____________. |
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| all matter in the Universe was once confined to a single point |
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| Biological processes have removed most of the _______ from the Earth's atmosphere. |
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| Atoms that are heavier than iron are generally produced by ____________. |
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Strong evidence that the Universe is expanding comes from the fact that the light emitted from distant
galaxies appears to be ____________. |
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| The Earth's atmosphere is rich in _____, a product of plant photosynthesis. |
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| When 17th century astronomer _______ first viewed Jupiter with his telescope he saw four satellites orbiting the planet. |
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| To the best of our knowledge, the Earth, Sun, and Moon are all the same age, about _______ years old. |
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| Aside from Earth, the terrestrial planets are ____________. |
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| Jupiter, Saturn, Uranus, and Neptune are surrounded by atmospheres of _______. |
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| The gas giant, or Jovian, planets are ____________. |
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Definition
| Jupiter, Saturn, Uranus, and Neptune |
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| The atmosphere of Venus is dominated by _________. |
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| ______ is the smallest of the inner four planets and closely resembles our moon. |
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| Venus and Earth have ________ surfaces and atmospheres |
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| The four planets nearest the sun are basically balls of rock and include ____. |
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