Across
1
Chemical element in table salt
4
Disturbance that transfers energy
5
Positive particle in nucleus
7
Smallest unit of an element
8
Glass that splits light into spectrum
12
Element found in all living things
Down
2
Hottest planet in solar system
3
Mass per unit volume
5
Tectonic landmass section
6
The Red Planet
9
Measure of matter in an object
10
Icy body with a tail near the sun
11
Fourth state of matter
13
Natural satellite of Earth