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Ch.23 (Final)

Origin of Earth and Solar System

____ 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