Across
1
Particle of light
5
Tissue that contracts for movement
7
Hottest planet in solar system
8
Form of thermal energy
9
Disturbance that transfers energy
12
Unit of energy
Down
1
Glass that splits light into spectrum
2
Force that attracts objects together
3
Absolute temperature scale unit
4
Our home planet
6
Basic unit of life
8
Second lightest element
10
Center of an atom or cell
11
Element found in all living things
13
Measure of matter in an object