Across
1
Hottest planet in solar system
3
Gas essential for breathing
6
Preserved remains of ancient life
7
Naturally occurring inorganic solid
8
Substance with pH below 7
Down
1
Gas form of a liquid
2
Substance with pH above 7
4
Nerve cell in the brain
5
Measure of matter in an object
9
Chemical element in table salt
10
Absolute temperature scale unit
11
Unit of heredity