Across
1
Blocking of light by a celestial body
3
Molten rock beneath Earth surface
5
Precious yellow metallic element
7
Group of similar cells
8
Gas essential for breathing
12
Gas form of a liquid
Down
2
Element found in all living things
3
Tissue that contracts for movement
4
Reddish electrical conductor
6
Nerve cell in the brain
9
Mass per unit volume
10
Unit of power
11
Push or pull on an object
13
Unit of heredity