Across
1
Hottest planet in solar system
4
Positive particle in nucleus
5
Amplified beam of light
7
Tissue that contracts for movement
11
Measure of matter in an object
12
Path of a planet around the sun
Down
1
Infectious microscopic agent
2
Group of similar cells
3
The Red Planet
6
Element found in all living things
8
Unit of force
9
Unit of energy
10
Curved glass that refracts light