Across
1
Our home planet
3
Molten rock beneath Earth surface
5
Unit of force
6
Natural satellite of Earth
10
Preserved remains of ancient life
11
The Red Planet
Down
2
Center of an atom or cell
3
Naturally occurring inorganic solid
4
Second lightest element
7
Path of a planet around the sun
8
Particle of light
9
Disturbance that transfers energy
12
Absolute temperature scale unit