Across
1
Reddish electrical conductor
3
Preserved remains of ancient life
6
Our home planet
9
Positive particle in nucleus
11
Tissue that contracts for movement
13
Force that attracts objects together
Down
2
Magnetic metallic element
4
Absolute temperature scale unit
5
Basic unit of life
7
Ball of burning gas in space
8
Unit of electric potential
10
Measure of matter in an object
12
Gas essential for breathing