Origin of Earth and Solar System
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| ____ are small, planetlike bodies. | Planetesimals
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| The Big Bang theory states that ____________. | all matter in the Universe was once confined to a single point
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| In our current understanding of the Big Bang, ____________. | the Universe is considerably older than Earth
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| Heat left over from this planetary formation process along with radioactive decay, drives the Earth's internal heat engine. | differentiation
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| The four planets nearest the sun are basically balls of rock and include ____. | Venus
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| The Earth's atmosphere is rich in _____, a product of plant photosynthesis. | oxygen
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| Mars is named for the Roman god of war, presumably because of its distinct _____ color when seen in the sky. | red
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| The gas giant, or Jovian, planets are ____________. | Jupiter, Saturn, Uranus, and Neptune
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| Biological processes have removed most of the _______ from the Earth's atmosphere. | carbon dioxide
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| The inner planets are sometimes called the terrestrial planets because of their resemblance to ____. | Earth
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| When 17th century astronomer _______ first viewed Jupiter with his telescope he saw four satellites orbiting the planet. | Galileo
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| In agreement with the Big Bang theory, our Universe is ____________. | expanding
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| To the best of our knowledge, the Earth, Sun, and Moon are all the same age, about _______ years old. To the best of our knowledge, the Earth, Sun, and Moon are all the same age, about _______ years old. | 4.6 billion
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| ______ is the smallest of the inner four planets and closely resembles our moon. | Mercury
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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 ____________. | solar wind
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| Aside from Earth, the terrestrial planets are ____________. | Mars, Mercury, and Venus
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| Our galaxy is called the ____. | Milky Way
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| ____ is the largest planet in both radius and mass. | Jupiter
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| The Moon's low average density tells us that the interior contains relatively little _______. | iron
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| The atmosphere of Venus is dominated by _________. | carbon dioxide
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| Atoms that are heavier than iron are generally produced by ____________. | explosion of supernovas
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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 ____________. | red shifted
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| To measure vast distances in the solar system, astronomers use the ____, the Earth's average distance from the Sun. | astronomical unit
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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. | very hot
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| This star provides the energy that drives Earth's external heat engine. | Sun
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| As planetismals struck the growing Earth, their impact energy in combination with ______ melted the planet. | radioactivity
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| Venus and Earth have ________ surfaces and atmospheres | very dissimilar
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| ______ is the planet that is most like the Earth in diameter and mass. | Venus
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| Jupiter, Saturn, Uranus, and Neptune are surrounded by atmospheres of _______. | hydrogen and helium
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| The four outer (giant) planets are composed largely of _______. | hydrogen
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| The sun, its eight planets and their moons, together with smaller objects such as asteroids and comets, form the ____. | solar system
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Created by:
Thomas.Siu
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