Across
1
Basic unit of life
5
Gas essential for breathing
6
Push or pull on an object
7
Tectonic landmass section
8
Group of similar cells
9
Ball of burning gas in space
11
The Red Planet
Down
2
Our home planet
3
Curved glass that refracts light
4
Solid with repeating atomic pattern
10
Measure of matter in an object
12
Force that attracts objects together
13
Positive particle in nucleus
14
Nerve cell in the brain