Across
1
Basic unit of life
3
Mass per unit volume
4
Ball of burning gas in space
6
Gas form of a liquid
10
Icy body with a tail near the sun
Down
1
Element found in all living things
2
Disturbance that transfers energy
5
Path of a planet around the sun
7
Hottest planet in solar system
8
The Red Planet
9
Gas essential for breathing