Across
1
Tectonic landmass section
4
Nerve cell in the brain
5
Form of thermal energy
7
Naturally occurring inorganic solid
8
Hottest planet in solar system
11
Smallest unit of an element
13
Preserved remains of ancient life
Down
2
Push or pull on an object
3
Our home planet
6
Group of similar cells
9
The Red Planet
10
Tissue that contracts for movement
12
Blocking of light by a celestial body