4. The Planets
The element that can act like a metal when it is under tremendous pressure and is probably responsible for Jupiter and Saturn's magnetism is:
hydrogen
At their centers, all Jovian planets have cores made of:
hydrogen and helium in the form of a gas
Which of the following is NOT a way that Venus resembles the Earth
the thickness and pressure of its atmosphere
Why does Venus looks so bright from Earth
It is relatively close to the Earth and is covered by clouds that reflect much of the sunlight
Astronomers estimate that the plains of Venus are only about 500 to 600 million years old. How do they estimate dates like this?
by counting the craters visible on the surface
The same gas makes up most of the atmosphere of Venus and Mars. This gas is:
carbon dioxide
By far the most abundant element in the giant (jovian) planets is:
hydrogen
Which of the following is NOT a way that Jupiter differs from terrestrial planets
its surface has many more craters from early collisions
The bluish color that makes the atmosphere of Neptune so beautiful to the human eye is caused by the interaction of sunlight with what gas?
methane
The process by which Venus became so much hotter than the Earth is called:
the runaway greenhouse effect