Across
1
Amplified beam of light
3
Unit of heredity
4
Molten rock beneath Earth surface
7
Fourth state of matter
9
Mass per unit volume
11
Substance with pH above 7
Down
2
Magnetic metallic element
4
Measure of matter in an object
5
Second lightest element
6
Our home planet
8
Curved glass that refracts light
10
Biological catalyst