Across
1
Unit of heredity
3
Measure of matter in an object
5
Second lightest element
8
Element found in all living things
9
Blocking of light by a celestial body
11
Substance with pH below 7
Down
2
Unit of energy
3
Tissue that contracts for movement
4
Molten rock beneath Earth surface
5
Form of thermal energy
6
Fourth state of matter
7
Magnetic metallic element
10
Substance with pH above 7
12
Naturally occurring inorganic solid