Across
1
Unit of electric potential
4
Absolute temperature scale unit
5
Substance with pH above 7
7
The Red Planet
8
Gas essential for breathing
12
Group of similar cells
Down
2
Natural satellite of Earth
3
Force that attracts objects together
6
Preserved remains of ancient life
9
Hottest planet in solar system
10
Glass that splits light into spectrum
11
Disturbance that transfers energy