Across
1
Our home planet
3
Unit of energy
6
Mass per unit volume
7
Icy body with a tail near the sun
9
Push or pull on an object
10
Tectonic landmass section
Down
2
Basic unit of life
4
Gas essential for breathing
5
Gas form of a liquid
8
Reddish electrical conductor
11
Magnetic metallic element
12
Compound containing oxygen