Across
1
Substance with pH below 7
2
Measure of matter in an object
3
Gas form of a liquid
4
Element found in all living things
5
Biological catalyst
8
Icy body with a tail near the sun
10
Preserved remains of ancient life
11
Ball of burning gas in space
Down
2
Naturally occurring inorganic solid
6
Unit of heredity
7
Smallest unit of an element
8
Solid with repeating atomic pattern
9
Reddish electrical conductor