Across
1
Icy body with a tail near the sun
4
Unit of electric potential
5
Second lightest element
7
Glass that splits light into spectrum
8
Our home planet
11
Substance with pH above 7
Down
2
Naturally occurring inorganic solid
3
Unit of heredity
4
Infectious microscopic agent
6
The Red Planet
9
Fourth state of matter
10
Tissue that contracts for movement