Across
1
Hottest planet in solar system
3
Smallest unit of an element
5
Force that attracts objects together
7
Glass that splits light into spectrum
8
Unit of force
12
Positive particle in nucleus
Down
2
Push or pull on an object
4
Nerve cell in the brain
6
Disturbance that transfers energy
7
Tectonic landmass section
9
Substance with pH above 7
10
Icy body with a tail near the sun
11
Reddish electrical conductor