Across
1
Unit of force
4
Measure of matter in an object
8
Form of thermal energy
9
Reddish electrical conductor
10
Particle of light
12
Biological catalyst
13
Unit of electric potential
Down
2
Chemical element in table salt
3
Natural satellite of Earth
5
Hottest planet in solar system
6
Ball of burning gas in space
7
Our home planet
11
Push or pull on an object