Across
1
Chemical element in table salt
3
Tectonic landmass section
6
Tissue that contracts for movement
7
Preserved remains of ancient life
10
Unit of force
12
Molten rock beneath Earth surface
13
Gas essential for breathing
Down
2
Gas form of a liquid
4
Natural satellite of Earth
5
Biological catalyst
8
Smallest unit of an element
9
Push or pull on an object
11
Curved glass that refracts light