Across
1
Unit of power
3
Gas form of a liquid
4
Nerve cell in the brain
6
Force that attracts objects together
7
Our home planet
9
Measure of matter in an object
10
Chemical element in table salt
Down
2
Tectonic landmass section
5
Gas essential for breathing
8
Reddish electrical conductor
9
Natural satellite of Earth
11
Disturbance that transfers energy
12
Unit of energy
13
Smallest unit of an element