Across
1
Icy body with a tail near the sun
4
Infectious microscopic agent
5
Smallest unit of an element
6
Form of thermal energy
7
Chemical element in table salt
8
Preserved remains of ancient life
9
Absolute temperature scale unit
Down
2
Compound containing oxygen
3
Solid with repeating atomic pattern
6
Second lightest element
10
Molten rock beneath Earth surface