1.
Pulls everything toward the Earth. (7)
2.
Slows things down when surfaces rub together. (8)
3.
How much matter is in an object. (4)
4.
How heavy something is because of gravity. (6)
7.
The tendency to keep moving or stay still. (7)
8.
Change in speed over time. (12)
9.
The path a planet takes around the sun. (5)
10.
The imaginary line Earth spins around. (4)
11.
Imaginary line around the middle of Earth. (7)
12.
Longest or shortest day of the year. (8)
13.
Day and night are equal length. (7)
14.
Spring, summer, autumn, or winter. (6)
15.
Orbits a star, like Earth or Mars. (6)
16.
Orbits a planet, like the Moon. (9)
17.
Rise and fall of ocean water. (5)
18.
Provides energy and warmth to Earth. (8)
19.
When the Sun, Moon, and Earth line up. (7)
20.
A icy rock with a glowing tail. (5)
