Across
1
Second lightest element
2
Compound containing oxygen
4
Basic unit of life
7
Unit of power
8
Our home planet
9
Form of thermal energy
10
Gas form of a liquid
Down
2
Path of a planet around the sun
3
Tectonic landmass section
4
Solid with repeating atomic pattern
5
Unit of heredity
6
Naturally occurring inorganic solid
11
Mass per unit volume