Across
1
Nerve cell in the brain
3
Basic unit of life
6
Amplified beam of light
8
Measure of matter in an object
10
Unit of electric potential
Down
2
Curved glass that refracts light
3
Icy body with a tail near the sun
4
The Red Planet
5
Substance with pH above 7
7
Biological catalyst
9
Tectonic landmass section