Across
1
Tissue that contracts for movement
4
Second lightest element
7
Compound containing oxygen
8
Preserved remains of ancient life
9
Magnetic metallic element
10
Substance with pH below 7
11
Fourth state of matter
Down
1
Measure of matter in an object
2
Curved glass that refracts light
3
Unit of heredity
5
Element found in all living things
6
Tectonic landmass section
12
Naturally occurring inorganic solid