Across
1
Molten rock beneath Earth surface
3
Blocking of light by a celestial body
5
Gas form of a liquid
7
Measure of matter in an object
9
Natural satellite of Earth
Down
2
Disturbance that transfers energy
4
Biological catalyst
5
Infectious microscopic agent
6
Force that attracts objects together
8
Amplified beam of light
9
The Red Planet