Across
1
Group of similar cells
3
Naturally occurring inorganic solid
5
Positive particle in nucleus
6
Second lightest element
8
Unit of power
10
Unit of force
Down
2
Preserved remains of ancient life
3
Measure of matter in an object
4
Our home planet
5
Tectonic landmass section
7
Reddish electrical conductor
9
Mass per unit volume