Across
1
Positive particle in nucleus
2
Disturbance that transfers energy
6
Curved glass that refracts light
8
Infectious microscopic agent
9
Icy body with a tail near the sun
10
Second lightest element
11
Substance with pH above 7
Down
1
Tectonic landmass section
3
Form of thermal energy
4
Naturally occurring inorganic solid
5
Ball of burning gas in space
7
Nerve cell in the brain