Across
1
The Red Planet
3
Unit of electric potential
6
Particle of light
8
Force that attracts objects together
11
Unit of heredity
Down
2
Our home planet
4
Gas essential for breathing
5
Curved glass that refracts light
7
Reddish electrical conductor
9
Chemical element in table salt
10
Magnetic metallic element
12
Hottest planet in solar system