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Ch.23 (Final)
Origin of Earth and Solar System
| Question | Answer |
|---|---|
| ____ are small, planetlike bodies. | Planetesimals |
| The Big Bang theory states that ____________. | all matter in the Universe was once confined to a single point |
| In our current understanding of the Big Bang, ____________. | the Universe is considerably older than Earth |
| Heat left over from this planetary formation process along with radioactive decay, drives the Earth's internal heat engine. | differentiation |
| The four planets nearest the sun are basically balls of rock and include ____. | Venus |
| The Earth's atmosphere is rich in _____, a product of plant photosynthesis. | oxygen |
| Mars is named for the Roman god of war, presumably because of its distinct _____ color when seen in the sky. | red |
| The gas giant, or Jovian, planets are ____________. | Jupiter, Saturn, Uranus, and Neptune |
| Biological processes have removed most of the _______ from the Earth's atmosphere. | carbon dioxide |
| The inner planets are sometimes called the terrestrial planets because of their resemblance to ____. | Earth |
| When 17th century astronomer _______ first viewed Jupiter with his telescope he saw four satellites orbiting the planet. | Galileo |
| In agreement with the Big Bang theory, our Universe is ____________. | expanding |
| 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 |
| ______ is the smallest of the inner four planets and closely resembles our moon. | Mercury |
| 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 |
| Aside from Earth, the terrestrial planets are ____________. | Mars, Mercury, and Venus |
| Our galaxy is called the ____. | Milky Way |
| ____ is the largest planet in both radius and mass. | Jupiter |
| The Moon's low average density tells us that the interior contains relatively little _______. | iron |
| The atmosphere of Venus is dominated by _________. | carbon dioxide |
| Atoms that are heavier than iron are generally produced by ____________. | explosion of supernovas |
| Strong evidence that the Universe is expanding comes from the fact that the light emitted from distant galaxies appears to be ____________. | red shifted |
| To measure vast distances in the solar system, astronomers use the ____, the Earth's average distance from the Sun. | astronomical unit |
| Differentiation of the core from the mantle early in Earth’s history was possible because the planet was ____________ at the time. | very hot |
| This star provides the energy that drives Earth's external heat engine. | Sun |
| As planetismals struck the growing Earth, their impact energy in combination with ______ melted the planet. | radioactivity |
| Venus and Earth have ________ surfaces and atmospheres | very dissimilar |
| ______ is the planet that is most like the Earth in diameter and mass. | Venus |
| Jupiter, Saturn, Uranus, and Neptune are surrounded by atmospheres of _______. | hydrogen and helium |
| The four outer (giant) planets are composed largely of _______. | hydrogen |
| The sun, its eight planets and their moons, together with smaller objects such as asteroids and comets, form the ____. | solar system |
Created by:
Thomas.Siu
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