Across
1
Disturbance that transfers energy
3
Force that attracts objects together
7
Measure of matter in an object
8
Basic unit of life
9
Second lightest element
11
Path of a planet around the sun
Down
1
Unit of power
2
Fourth state of matter
4
Tissue that contracts for movement
5
Substance with pH below 7
6
Gas form of a liquid
10
Particle of light