Across
1
Curved glass that refracts light
4
Element found in all living things
5
Fourth state of matter
6
Hottest planet in solar system
7
Preserved remains of ancient life
11
Unit of energy
Down
2
Positive particle in nucleus
3
Tectonic landmass section
7
Push or pull on an object
8
Reddish electrical conductor
9
Icy body with a tail near the sun
10
Unit of force
12
Chemical element in table salt