Across
1
Amplified beam of light
3
Push or pull on an object
6
Element found in all living things
7
Particle of light
8
Disturbance that transfers energy
Down
2
Gas essential for breathing
4
Unit of energy
5
Icy body with a tail near the sun
6
Basic unit of life
9
Measure of matter in an object
10
Molten rock beneath Earth surface
11
Biological catalyst