Across
1
Absolute temperature scale unit
3
Push or pull on an object
5
Icy body with a tail near the sun
6
Unit of heredity
9
The Red Planet
10
Amplified beam of light
12
Smallest unit of an element
Down
2
Center of an atom or cell
4
Path of a planet around the sun
7
Chemical element in table salt
8
Positive particle in nucleus
9
Molten rock beneath Earth surface
11
Tissue that contracts for movement