Across
1
Force that attracts objects together
2
Molten rock beneath Earth surface
4
Nerve cell in the brain
6
Gas form of a liquid
9
Preserved remains of ancient life
12
Unit of power
Down
2
Naturally occurring inorganic solid
3
Gas essential for breathing
5
Magnetic metallic element
7
Smallest unit of an element
8
Substance with pH above 7
10
Fourth state of matter
11
Natural satellite of Earth