Across
1
Our home planet
3
Preserved remains of ancient life
7
Tissue that contracts for movement
8
Form of thermal energy
10
Disturbance that transfers energy
13
Molten rock beneath Earth surface
Down
2
Basic unit of life
4
Group of similar cells
5
Gas essential for breathing
6
Hottest planet in solar system
9
Reddish electrical conductor
11
Blocking of light by a celestial body
12
Fourth state of matter