Across
1
Element found in all living things
4
Gas essential for breathing
5
Amplified beam of light
6
Particle of light
10
Measure of matter in an object
11
Our home planet
Down
2
The Red Planet
3
Unit of force
6
Tectonic landmass section
7
Natural satellite of Earth
8
Force that attracts objects together
9
Smallest unit of an element