Across
1
Reddish electrical conductor
3
Our home planet
4
Basic unit of life
5
Element found in all living things
7
Gas essential for breathing
Down
2
Form of thermal energy
3
Biological catalyst
6
Ball of burning gas in space
Reddish electrical conductor
Our home planet
Basic unit of life
Element found in all living things
Gas essential for breathing
Form of thermal energy
Biological catalyst
Ball of burning gas in space