Across
1
Unit of heredity
4
Naturally occurring inorganic solid
5
Glass that splits light into spectrum
9
Form of thermal energy
10
Absolute temperature scale unit
11
Biological catalyst
Down
2
Substance with pH above 7
3
Our home planet
6
Path of a planet around the sun
7
Blocking of light by a celestial body
8
Center of an atom or cell
12
The Red Planet