Across
1
Hottest planet in solar system
4
Fourth state of matter
6
Positive particle in nucleus
7
Substance with pH above 7
9
Unit of force
Down
2
Our home planet
3
The Red Planet
5
Measure of matter in an object
8
Nerve cell in the brain
Hottest planet in solar system
Fourth state of matter
Positive particle in nucleus
Substance with pH above 7
Unit of force
Our home planet
The Red Planet
Measure of matter in an object
Nerve cell in the brain