Across
1
Substance with pH above 7
3
Curved glass that refracts light
5
Amplified beam of light
7
Particle of light
8
Hottest planet in solar system
9
Disturbance that transfers energy
10
Molten rock beneath Earth surface
Down
2
Blocking of light by a celestial body
4
Nerve cell in the brain
6
Basic unit of life
7
Glass that splits light into spectrum
11
Measure of matter in an object