Across
1
Particle of light
4
Disturbance that transfers energy
5
Ball of burning gas in space
6
Icy body with a tail near the sun
7
Unit of electric potential
10
Element found in all living things
Down
2
Gas essential for breathing
3
Preserved remains of ancient life
6
Solid with repeating atomic pattern
8
Measure of matter in an object
9
Our home planet