Across
1
The Red Planet
4
Molten rock beneath Earth surface
5
Measure of matter in an object
6
Natural satellite of Earth
8
Gas form of a liquid
Down
2
Smallest unit of an element
3
Amplified beam of light
4
Naturally occurring inorganic solid
7
Particle of light
9
Substance with pH below 7
10
Disturbance that transfers energy
11
Solid with repeating atomic pattern