Across
1
Mass per unit volume
4
Naturally occurring inorganic solid
7
Group of similar cells
8
Unit of power
9
Substance with pH above 7
11
Chemical element in table salt
12
Infectious microscopic agent
Down
2
Our home planet
3
Path of a planet around the sun
4
Tissue that contracts for movement
5
Positive particle in nucleus
6
Biological catalyst
10
Amplified beam of light