Across
1
Mass per unit volume
6
Push or pull on an object
7
Unit of power
8
Positive particle in nucleus
9
Amplified beam of light
Down
2
The Red Planet
3
Substance with pH below 7
4
Unit of force
5
Tectonic landmass section
10
Nerve cell in the brain
11
Naturally occurring inorganic solid
12
Reddish electrical conductor