Across
1
Biological catalyst
4
Compound containing oxygen
6
Form of thermal energy
7
Push or pull on an object
9
Smallest unit of an element
10
Magnetic metallic element
13
Unit of power
Down
2
Tectonic landmass section
3
Chemical element in table salt
5
Gas essential for breathing
8
Mass per unit volume
11
Nerve cell in the brain
12
Particle of light