Across
1
Tectonic landmass section
3
Path of a planet around the sun
4
Disturbance that transfers energy
5
Naturally occurring inorganic solid
9
Unit of energy
10
Basic unit of life
Down
2
Substance with pH above 7
3
Compound containing oxygen
6
Our home planet
7
Smallest unit of an element
8
Amplified beam of light