unit 2

What is the air on Venus mostly composed of? a) carbon dioxide b) hydrogen c) gas d) oxygen

a) carbon dioxide

What planet has an axis tilt similar to Mars? a) Earth b) Venus c) Saturn d) Mercury

a) earth

On planet Earth, Tom weighs 150 lbs. How much would he weigh on Mercury? a) 75 lbs. b) 57 lbs. c) 200 lbs. d) 10 lbs.

b) 57 lbs

Under the influence of gravity, matter in the solar nebula condensed into a dense central region, called the protosun, and a less dense outer ring, called a _____, also known as a _____. a) polyplyd; protoplanetary disk b) protoplanetary disk; polyplyd c) inner planets; outer planets d) retrograde; rotation

b) protoplanetary disk; polyplyd

When matter in the solar nebula condensed into a dense central region under the influence of gravity, what was it called? a) polyplyd b) protosun c) protoplanetary disk d) extrasolar

b) protosun

What percentage of Venus' surface is composed of low-lying volcanic plains with large amounts of flowing lava? a) 25 percent b) 70 percent c) 85 percent d) 10 percent

c) 85 percent

Why does Mercury have a very thin and temporary atmosphere? a) The mass of the planet means that it has no use for an atmosphere that continuously stays around the planet. b) The mass of the planet is too large for an atmosphere to continuously stay around the planet. c) The mass of the planet is too small for an atmosphere to continuously stay around the planet. d) The air quality of the planet is too dense for an atmosphere to continuously stay around the planet.

c) The mass of the planet is too small for an atmosphere to continuously stay around the planet.

What three layers does Mercury have? a) inside, outside, and internal b) top, middle, and lower c) a core, mantle, and crust d) silicate, sulfur, and mission

c) a core, mantle, and crust

This planet is the outermost of the four inner terrestrial planets and has a rust-red color. It is named after a Roman god of war and is perhaps the most studied planet in the solar system besides Earth. This planet has two moons and it orbits elliptically around the Sun. What planet is being described here? a) Venus b) Jupiter c) Mars d) Mercury

c) mars

What are the only solid materials that could survive the forces from the collapse of the solar nebula? a) gallium and sulfur b) magnesium and copper c) rocky and metallic d) helium and oxygen

c) rocky and metallic

Like Earth, Mercury has one moon. True False

false

Unlike other terrestrial planets, Mars has a core, mantle, and crust. True False

false

Astronomers believe that the solar system began forming from the great explosion of the big bang, approximately 3.7 billion years ago. True False

true

Planets look like bright stars when they are viewed from Earth. True False

true

The steep north and south ridges on Mercury stretch up to almost 2 miles high and over 300 miles long. True False

true