Across
1
Naturally occurring inorganic solid
6
Push or pull on an object
7
Natural satellite of Earth
8
Icy body with a tail near the sun
9
Group of similar cells
12
Blocking of light by a celestial body
13
Basic unit of life
Down
2
Our home planet
3
Center of an atom or cell
4
Gas essential for breathing
5
Biological catalyst
10
Particle of light
11
Form of thermal energy
14
Ball of burning gas in space