Across
1
Element found in all living things
3
Solid with repeating atomic pattern
4
Positive particle in nucleus
6
Unit of heredity
8
Form of thermal energy
9
The Red Planet
10
Chemical element in table salt
Down
2
Fourth state of matter
4
Particle of light
5
Blocking of light by a celestial body
7
Preserved remains of ancient life
9
Naturally occurring inorganic solid
11
Substance with pH above 7
12
Absolute temperature scale unit