Earth in Space

The inner planets are composed mainly of __________.

• A) water
• B) methane
• C) rocks
• D) gases

The Sun appears to rise and set because of __________.

• A) the shape of the Sun
• B) the rotation of Earth
• C) the orbit of the Moon
• D) the orbit around the Sun

What is the order during a solar eclipse?

• A) Earth, Sun, Moon
• B) Moon, Earth, Sun
• C) Sun, Moon, Earth
• D) Moon, Sun, Earth

The __________ of the Moon were formed from lava flows.

• A) craters
• B) oceans
• C) maria
• D) surface features

An astronomical unit is __________.

• A) equal to a light-year
• B) the distance between Earth and the Sun
• C) smaller than a kilometer
• D) the distance between Earth and the Moon

Which is the only outer planet that is not a gas giant?

• A) Jupiter
• B) Pluto
• C) Saturn
• D) Neptune

Which moon of Jupiter might contain oceans of water?

• A) Callisto
• B) Io
• C) Europa
• D) Ganymede

What is the shape of Earth?

• A) perfectly spherical
• B) flat
• C) almost spherical
• D) varying

One orbit of Earth around the Sun is called a(n) __________.

• A) orbit
• B) rotation
• C) spin
• D) revolution

When the daytime is as long as the night, this is a(n) __________.

• A) solstice
• B) eclipse
• C) equinox
• D) tropic