Across
1
Blocking of light by a celestial body
3
Natural satellite of Earth
4
Icy body with a tail near the sun
5
Mass per unit volume
8
Basic unit of life
10
Molten rock beneath Earth surface
Down
2
Particle of light
4
Reddish electrical conductor
6
Tissue that contracts for movement
7
Push or pull on an object
9
Solid with repeating atomic pattern