Across
1
Nerve cell in the brain
3
The Red Planet
7
Gas essential for breathing
8
Unit of power
9
Element found in all living things
11
Gas form of a liquid
Down
2
Chemical element in table salt
4
Push or pull on an object
5
Icy body with a tail near the sun
6
Ball of burning gas in space
10
Precious yellow metallic element
11
Hottest planet in solar system