Across
1
Nerve cell in the brain
2
Hottest planet in solar system
4
Naturally occurring inorganic solid
5
Molten rock beneath Earth surface
6
Absolute temperature scale unit
9
Biological catalyst
10
Our home planet
12
Element found in all living things
Down
1
Unit of force
2
Infectious microscopic agent
3
Chemical element in table salt
7
The Red Planet
8
Natural satellite of Earth
11
Substance with pH below 7