Across
1
Reddish electrical conductor
4
Positive particle in nucleus
7
Infectious microscopic agent
8
The Red Planet
9
Biological catalyst
10
Precious yellow metallic element
14
Our home planet
Down
2
Naturally occurring inorganic solid
3
Path of a planet around the sun
5
Gas essential for breathing
6
Unit of force
11
Measure of matter in an object
12
Nerve cell in the brain
13
Ball of burning gas in space