Across
1
Disturbance that transfers energy
4
Nerve cell in the brain
5
Element found in all living things
8
Unit of electric potential
9
Molten rock beneath Earth surface
11
Tectonic landmass section
Down
2
Force that attracts objects together
3
Blocking of light by a celestial body
6
Curved glass that refracts light
7
Absolute temperature scale unit
10
Reddish electrical conductor
12
Preserved remains of ancient life
13
Magnetic metallic element