Across
1
Our home planet
3
Infectious microscopic agent
4
Fourth state of matter
5
Unit of force
7
Center of an atom or cell
11
Reddish electrical conductor
12
Icy body with a tail near the sun
Down
2
Glass that splits light into spectrum
3
Hottest planet in solar system
4
Particle of light
6
Curved glass that refracts light
8
Tectonic landmass section
9
Unit of energy
10
Second lightest element