Across
1
Blocking of light by a celestial body
5
Smallest unit of an element
7
Unit of electric potential
8
Biological catalyst
9
Amplified beam of light
10
Measure of matter in an object
Down
2
Substance with pH above 7
3
Path of a planet around the sun
4
Icy body with a tail near the sun
6
Tectonic landmass section