Across
1
Our home planet
3
Tissue that contracts for movement
5
Curved glass that refracts light
8
Gas form of a liquid
9
Group of similar cells
11
Push or pull on an object
Down
2
Measure of matter in an object
3
Natural satellite of Earth
4
Basic unit of life
6
Path of a planet around the sun
7
Ball of burning gas in space
10
Fourth state of matter
12
Mass per unit volume