Across
1
Force that attracts objects together
3
Unit of force
5
Icy body with a tail near the sun
7
Path of a planet around the sun
9
Compound containing oxygen
10
Disturbance that transfers energy
11
Our home planet
Down
2
Preserved remains of ancient life
4
Natural satellite of Earth
6
Amplified beam of light
7
Gas essential for breathing
8
Unit of electric potential