Across
1
Force that attracts objects together
4
Reddish electrical conductor
6
Unit of force
10
Preserved remains of ancient life
11
Group of similar cells
13
Amplified beam of light
Down
2
Our home planet
3
Tectonic landmass section
5
Gas essential for breathing
7
Magnetic metallic element
8
Compound containing oxygen
9
Ball of burning gas in space
12
Chemical element in table salt