The inner planets are also called...

• terrestrial planets
• gas giants

Which planet is closest to the sun?

• Earth
• Venus
• Mercury
• Mars

The motion of a body orbiting another body in space is called _____.

• revolution 
• period of revolution
• rotation
• period of rotation

In many ways, which planet is more like Earth than any other planet?

• Mercury
• Mars
• Venus

The air on Venus is mostly ____.

• carbon dioxide
• oxygen
• sulfur

Data gathered from radar waves showed that Venus, like Earth, also has ___.

• earthquakes
• volcanoes
• storms
• hurricanes

Liquid _____ is a vital part of the chemical processes that living things depend on for survival on Earth.

• water
• oxygen
• mercury

Which inner planet is the hottest?

• Mercury
• Venus
• Earth
• Mars

Which two inner planets are known as "sister planets?"

• Venus and Mars
• Mars and Earth
• Venus and Earth

Earth is the ___________ planet from the Sun.

• First
• Second
• Third
• Fourth