Unit 18: Planets Review

Which planets are often called the terrestrial planets?

• Mercury, Venus, Earth, and Mars
• Venus, Earth, Mars, Jupiter
• Mercury, Jupiter, Saturn, Uranus
• Jupiter, Saturn, Uranus, Neptune

Which planet rotates on its axis in about the same amount of time that Earth does?

• Mars
• Venus
• Mercury
• Jupiter

What are the 3 main layers of the Earth?

• Magma, Crust, Core
• Crust, Mantle, Core
• Lithosphere, Asthenosphere, Mesosphere
• Outer core, Inner core, Mantle

What is Earth's dense inner core made of?

• Aluminum and titanium
• Gold and silver
• Copper and zinc
• Iron and nickel

Which planet is tidal-locked to the sun?

• Venus
• Earth
• Mars
• Mercury

Which planet is the smallest in the solar system?

• Jupiter
• Mercury
• Earth
• Venus

Why does Mercury have a greater range of temperatures than any other planet?

• Mercury has almost no atmosphere to retain heat.
• Mercury is closer to the Sun than any other planet.
• Mercury has a highly reflective surface that causes temperature fluctuations.
• Mercury has a thick atmosphere that traps heat.

Because Venus is often a bright object in the west after sunset, it is sometimes called the

• Evening Star
• Afternoon Star
• Night Star
• Morning Star

Why are Venus and Earth sometimes referred to as "sister planets"?

• They are the closest planets to Mars.
• They are similar in size, composition, and proximity to the Sun.
• They are the only planets with moons.
• They have different atmospheres and surface temperatures.

The gas that makes up most of Venus's atmosphere is?

• nitrogen (N2)
• methane (CH4)
• carbon dioxide (CO2)
• oxygen (O2)