Across
1
Force that attracts objects together
4
Ball of burning gas in space
5
Basic unit of life
6
Tissue that contracts for movement
7
Substance with pH above 7
8
Particle of light
10
The Red Planet
Down
2
Magnetic metallic element
3
Group of similar cells
5
Solid with repeating atomic pattern
6
Natural satellite of Earth
9
Mass per unit volume