Across
1
Path of a planet around the sun
4
Naturally occurring inorganic solid
7
Preserved remains of ancient life
8
Gas form of a liquid
10
Glass that splits light into spectrum
11
Infectious microscopic agent
Down
2
Natural satellite of Earth
3
Second lightest element
5
Group of similar cells
6
Force that attracts objects together
7
Push or pull on an object
9
Substance with pH below 7