Across
1
Icy body with a tail near the sun
4
Natural satellite of Earth
6
Fourth state of matter
7
Chemical element in table salt
Down
2
Smallest unit of an element
3
Second lightest element
5
Hottest planet in solar system
8
Center of an atom or cell
9
Compound containing oxygen
10
Measure of matter in an object
11
Tissue that contracts for movement