Across
1
Form of thermal energy
4
Path of a planet around the sun
5
Substance with pH above 7
6
Naturally occurring inorganic solid
7
Disturbance that transfers energy
9
Element found in all living things
Down
2
Our home planet
3
Unit of force
6
The Red Planet
8
Preserved remains of ancient life
10
Hottest planet in solar system
11
Amplified beam of light