Across
1
Biological catalyst
3
Second lightest element
4
Unit of electric potential
5
Tectonic landmass section
6
Path of a planet around the sun
7
Molten rock beneath Earth surface
Down
1
Our home planet
2
Element found in all living things
3
Form of thermal energy
8
Solid with repeating atomic pattern
9
Group of similar cells
10
Magnetic metallic element