Chapter 7 Earth Our Home in Space

What is one way the sun differs from both Earth and the moon?

• The sun does not have an atmosphere.

• The sun produces light.

• The sun does not rotate on an axis.

• The sun has layers beneath its surface.

What causes day and night on Earth?

• Earth's rotation around its axis

• Earth's revolution around the sun

• The movement of the sun around Earth

• The tilt of Earth's axis

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Identify a physical characteristic of the moon that explains why the moon does not support life as we know it on Earth.

• The moon is about one-fourth the size of Earth.

• The moon has a solid inner core.

• The moon has almost no atmosphere.

• Meteors hit the moon.

The hydrosphere is a physical characteristic of Earth but not of the moon or the sun. Which of Earth's layers holds the hydrosphere?

• Outer core

• Inner core

• Mantle

• Crust

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Why is it day at the location of the X in South America and night in Africa?

• Earth is revolving around the sun.

• Earth has an imaginary line through it.

• The sun rises in the east and sets in the west.

• South America is turned toward the sun; Africa is turned away from it.

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Why isn't Earth's moon considered to be a planet?

• It is made up of rock instead of gas.

• It does not support living things.

• It does not have liquid water on it.

• It orbits Earth rather than the sun.

In the 1600s the scientist Galileo made improvements to the telescope and used it to study objects in space. His studies convinced him that the theories of his day about the sun and planets were wrong. What can you infer is one way that Galileo changed out knowledge of the solar system?

• Galileo helped prove that Earth is the center of the solar system.

• Galileo helped prove that Venus is the center of the solar system.

• Galileo helped prove that the sun is the center of the solar system.

• Galileo helped prove that the moon is the center of the solar system.

What part of the solar system does this diagram represent?

• the Milky Way

• Earth

• the sun

• a galaxy

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How is Earth's orbit similar to the moon's orbit?

• Both Earth and the moon orbit the sun.

• Earth orbits the sun in an oval-shaped path the same way the moon orbits Earth.

• Earth's revolution around the sun takes the same amount of time as the moon's revolution around Earth.

• Both Earth and the moon orbit a star.

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What causes the eclipse that is shown in this diagram?

• Earth revolves around the moon to just the right position with the sun.

• The sun moves into alignment with the moon and Earth.

• The sun is the center of the solar system; it does not move.

• The moon passes in front of the sun in its orbit.

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