Across
1
Element found in all living things
3
Gas form of a liquid
4
Blocking of light by a celestial body
7
Measure of matter in an object
11
Unit of energy
Down
2
Substance with pH above 7
3
Hottest planet in solar system
5
Center of an atom or cell
6
Infectious microscopic agent
8
Molten rock beneath Earth surface
9
Particle of light
10
Amplified beam of light
12
Push or pull on an object