Across
1
Ball of burning gas in space
3
Reddish electrical conductor
4
Center of an atom or cell
8
Our home planet
9
Unit of power
10
Biological catalyst
Down
1
Chemical element in table salt
2
Positive particle in nucleus
5
Form of thermal energy
6
Unit of force
7
Unit of energy
11
Element found in all living things
12
Natural satellite of Earth