Across
1
Tissue that contracts for movement
5
Magnetic metallic element
6
Chemical element in table salt
8
Absolute temperature scale unit
9
Unit of energy
12
Mass per unit volume
13
Unit of force
Down
2
Fourth state of matter
3
Element found in all living things
4
Amplified beam of light
7
Nerve cell in the brain
10
Gas essential for breathing
11
Substance with pH above 7