Across
1
Curved glass that refracts light
2
Icy body with a tail near the sun
4
Glass that splits light into spectrum
5
Form of thermal energy
6
Mass per unit volume
10
Solid with repeating atomic pattern
Down
2
Element found in all living things
3
Fourth state of matter
7
Push or pull on an object
8
Unit of heredity
9
The Red Planet