Across
1
Chemical element in table salt
3
Our home planet
6
Nerve cell in the brain
11
Push or pull on an object
12
Absolute temperature scale unit
Down
2
Path of a planet around the sun
4
Disturbance that transfers energy
5
Force that attracts objects together
7
Measure of matter in an object
8
Gas essential for breathing
9
Element found in all living things
10
Substance with pH below 7