Across
1
Compound containing oxygen
5
Basic unit of life
6
Mass per unit volume
7
Biological catalyst
8
Disturbance that transfers energy
9
Measure of matter in an object
12
Path of a planet around the sun
Down
2
Naturally occurring inorganic solid
3
Icy body with a tail near the sun
4
Group of similar cells
8
Unit of power
10
Precious yellow metallic element
11
Glass that splits light into spectrum