Across
1
Measure of matter in an object
3
Reddish electrical conductor
4
Naturally occurring inorganic solid
6
Particle of light
8
Disturbance that transfers energy
9
Element found in all living things
11
Precious yellow metallic element
Down
2
Biological catalyst
3
Solid with repeating atomic pattern
5
Form of thermal energy
7
Absolute temperature scale unit
9
Icy body with a tail near the sun
10
Basic unit of life