The Inner Planets

Front

Which inner planet is covered mostly with water?

Back

Earth is the inner planet that is covered mostly with water.

Front

Which of the inner planets has the longest year?

Back

Mars has the longest year among the inner planets.

Front

Which inner planet is covered with craters?

Back

Mercury is the inner planet that is covered with craters.

Front

The orbits of the planets have a slightly ____ shape.

Back

The orbits of the planets have a slightly elliptical shape.

Front

What force keeps the planets in orbit?

Back

Gravity is the force that keeps the planets in orbit.

Front

What are the four inner planets?

Back

The four inner planets are Mercury, Venus, Earth, and Mars.

Front

Which inner planet is known as the 'Red Planet'?

Back

Mars is known as the 'Red Planet'.

Front

What is the closest planet to the Sun?

Back

Mercury is the closest planet to the Sun.

Front

Which inner planet has a thick atmosphere that traps heat?

Back

Venus has a thick atmosphere that traps heat.

Front

What is the main component of Earth's atmosphere?

Back

The main component of Earth's atmosphere is nitrogen.