Chapter 27

The _______ is between the orbits of Mars and Jupiter. 

• Oort Cloud
• Asteroid belt
• Kuiper belt
• Photosphere

Which outer planets have rings?

• Just Saturn
• Saturn and Jupiter
• Jupiter, Neptune, and Saturn
• All 4 of them

What is true about the inner planets?

• They are smaller, denser, and rocky.
• They are made of gas.
• They have many moons.
• They have rings.

What is known about the outer planets?

• They are smaller.
• They are made of rock.
• They are larger, have many moons, and are made of gas.
• They have no rings.

The _____ is found right after Neptune's orbit. It contains dwarf planets and other small icy bodies.

• Meteroid belt
• Kuiper Belt
• Oort Cloud
• Asteroid Belt

Which factor makes Earth different from all the other planets in the solar system in its ability to support life? 

• The Earth is exposed to rays from the sun. 
• The Earth has only one moon that orbits around it. 
• The Earth rotates in an elliptical orbit around the sun. 
• The Earth has a breathable atmosphere. 

Earth's early oceans became salty when

• dissolved solids were carried from land to the water.
• salt dropped down from the sky.
• organisms died and added salt to the water.
• when they were first formed.

A small body that orbits a planet is a(n)

• comet
• moon
• asteroid
• exoplanet

Objects that circle stars other than Earth's sun are

• moons
• exoplanets
• rings
• planetesimals

Which of these planets is most similar to Uranus in terms of size and mass?

• Pluto
• Earth
• Jupiter
• Neptune

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