Across
1
Blocking of light by a celestial body
6
Element found in all living things
7
Smallest unit of an element
8
Unit of force
12
Compound containing oxygen
Down
2
Unit of electric potential
3
Basic unit of life
4
Gas essential for breathing
5
Tectonic landmass section
9
Infectious microscopic agent
10
Form of thermal energy
11
Mass per unit volume