Across
1
Disturbance that transfers energy
4
Smallest unit of an element
5
Icy body with a tail near the sun
8
Infectious microscopic agent
9
Naturally occurring inorganic solid
Down
2
Gas essential for breathing
3
Our home planet
6
Measure of matter in an object
7
Unit of power
10
Reddish electrical conductor
11
Compound containing oxygen