Across
1
Blocking of light by a celestial body
5
Tissue that contracts for movement
6
Curved glass that refracts light
9
Path of a planet around the sun
10
Form of thermal energy
Down
2
Reddish electrical conductor
3
Amplified beam of light
4
Substance with pH above 7
5
Molten rock beneath Earth surface
7
Infectious microscopic agent
8
Preserved remains of ancient life
10
Second lightest element