Across
1
Push or pull on an object
4
Tectonic landmass section
5
Mass per unit volume
7
Form of thermal energy
10
Icy body with a tail near the sun
Down
2
Gas essential for breathing
3
Unit of force
4
Fourth state of matter
6
Ball of burning gas in space
8
Absolute temperature scale unit
9
Our home planet
11
Path of a planet around the sun