Across
1
Tectonic landmass section
3
Gas essential for breathing
6
Naturally occurring inorganic solid
7
Hottest planet in solar system
8
Second lightest element
9
Biological catalyst
10
Element found in all living things
12
Measure of matter in an object
Down
2
Unit of force
4
Tissue that contracts for movement
5
Chemical element in table salt
11
Reddish electrical conductor