Across
1
Push or pull on an object
4
Particle of light
7
Glass that splits light into spectrum
8
Our home planet
9
Compound containing oxygen
Down
2
The Red Planet
3
Mass per unit volume
5
Element found in all living things
6
Reddish electrical conductor
10
Hottest planet in solar system
11
Unit of heredity
12
Disturbance that transfers energy