Across
1
Blocking of light by a celestial body
4
The Red Planet
5
Infectious microscopic agent
6
Center of an atom or cell
8
Basic unit of life
Down
2
Amplified beam of light
3
Chemical element in table salt
4
Measure of matter in an object
5
Unit of electric potential
7
Curved glass that refracts light
9
Natural satellite of Earth
10
Molten rock beneath Earth surface