Across
1
Infectious microscopic agent
4
Preserved remains of ancient life
6
Unit of force
7
Molten rock beneath Earth surface
9
The Red Planet
10
Blocking of light by a celestial body
12
Reddish electrical conductor
Down
1
Unit of electric potential
2
Our home planet
3
Curved glass that refracts light
5
Measure of matter in an object
8
Smallest unit of an element
11
Hottest planet in solar system
13
Substance with pH below 7