Across
1
Hottest planet in solar system
4
Measure of matter in an object
5
Particle of light
6
Force that attracts objects together
7
Molten rock beneath Earth surface
Down
1
Infectious microscopic agent
2
Group of similar cells
3
Glass that splits light into spectrum
8
Curved glass that refracts light
9
Unit of heredity
10
Unit of electric potential