Which of the following best explains why Mars' and Venus' surface temperatures vary, despite both planets having atmospheres that contain mostly carbon dioxide?(1 point)
Responses
Mars has a thin atmosphere that cannot hold much heat.
Mars has a thin atmosphere that cannot hold much heat.
Venus has a surface of high mountains which absorb heat.
Venus has a surface of high mountains which absorb heat.
Mars has a surface of red rocks and sand which reflect heat.
Mars has a surface of red rocks and sand which reflect heat.
Venus has a thick atmosphere which blocks heat from the surface.
Its atmosphere is rich in carbon dioxide gas.
Jupiter
less than 1 percent
Why is Venus the hottest solar system planet?(1 point)
Responses
It is closest to the sun.
It is closest to the sun.
It has abundance of nitrogen and oxygen gases.
It has abundance of nitrogen and oxygen gases.
Its atmosphere is rich in carbon dioxide gas.
Its atmosphere is rich in carbon dioxide gas.
It has a core, a mantle, and a crust.
The table shows properties of some planets in the solar system.
Property Venus Earth Mars Jupiter Saturn Neptune
Average Distance from the Sun (AU) 0.72 1.0 1.5 5.2 9.5 30
Length of Year (Earth years) 0.62 1.0 1.9 11.9 29.4 164.8
Time for One Rotation (Earth days) 243 1.0 1.03 0.41 0.44 0.67
Mass (compared to Earth) 0.80 1.0 0.1 318 95 17
Surface Gravity (compared to Earth) 0.90 1.0 0.38 2.53 1.06 1.14
Size (compared to Earth) 0.94 1.0 0.53 11.0 9.1 3.9
Average Surface Temperature (ºC) 462 14 –62 –145 –140 –214
Number of Moons 0 1 2 79 82 14
The weight of an object depends on the force of gravity acting on it. On which planet would a given object weigh the most?
(1 point)
Responses
Earth
Earth
Mars
Mars
Saturn
Saturn
Jupiter
Jupiter
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Which percent of Earth’s atmosphere does carbon dioxide gas make up?(1 point)
Responses
more than 99 percent
more than 99 percent
less than 1 percent
less than 1 percent
about 78 percent
about 78 percent
about 21 percent