Across
1
Force that attracts objects together
4
Chemical element in table salt
7
Tissue that contracts for movement
9
Substance with pH below 7
11
Absolute temperature scale unit
12
Particle of light
Down
2
Glass that splits light into spectrum
3
Our home planet
5
Unit of electric potential
6
Magnetic metallic element
8
Infectious microscopic agent
10
Push or pull on an object
13
Tectonic landmass section