Download Section # 21 Inner Planets Worksheet

Name_______________________________________________ Team_________________________ Period_____
Intro to the Solar System & the Inner Planets
1.
2.
3.
4.
5.
6.
7.
8.
9.
The attractive force that draws two objects together and causes one to orbit the other is
called _________________________.
A(n) _________________________ is a unit used to measure the large distances between
objects in our solar system.
A(n) _________________________ is a unit used to measure the large distances between
the stars.
_________________________ is the planet closest to the Sun, which has very little
atmosphere.
The planet with an atmosphere made up mostly of nitrogen and oxygen is
_________________________.
The planet with polar ice caps and areas of water ice near the surface, but shows no
evidence of life is _________________________.
_________________________ is similar to the Earth in size, but is covered with thick
clouds.
A _________________________ system is one in which planets revolve around a star.
The path taken by one object around another due to mutual gravitational attraction is called
a(n) _________________________.
10. The _________________________ states that the force of gravity acts between all objects
in the universe.
11. An object that is in orbit around the Sun, has enough mass to be round in shape, and has
‘cleared the neighborhood’ around its orbit is known as a(n) _________________________.
12. The inner planets are also known as _________________________ planets because of their
common traits with Earth.
13. The inner planets with moons are _________________________ and
_________________________.
14. The only inner planet with liquid water is _________________________.
15. _________________________ is the inner planet with the most craters.
16. _________________________ is known as the evening or morning star.
17. _________________________ has the largest impact crater, the largest volcano, and the
largest canyon of all inner planets.
18. The inner planet that rotates backward is _________________________.
19. _________________________ and _________________________ are the inner planets
that experience seasons.
20. _________________________ has an extreme greenhouse effect with thick acid clouds.