Which planet in the Solar System?

Which of the following is a gas giant because it has a deep, massive atmosphere?

Which planet has the most volcanoes?

Which planet has a large range of temperatures because it lacks an atmosphere to hold in heat?

Which planet is the hottest?

Which planet is sometimes called Earth's twin because it has the same size and density?

Which of the following could NOT be a gas giant because it is dense and rocky?

Which planet may have had surface water or flowing rivers at one time?

Which planet has the highest surface temperature due to its thick clouds and carbon dioxide?

How many stars are in our solar system?

Which planet may once have had a warmer climate because it has dry river beds?

Which is the only planet that has oxygen, liquid water, and perfect temperatures for humans?

What is the only planet humans have walked on?

Which planet has a hurricane-type cloud known as the Great Red Spot?