Across
1
Measure of matter in an object
2
Blocking of light by a celestial body
3
Natural satellite of Earth
4
Unit of heredity
6
Disturbance that transfers energy
9
Hottest planet in solar system
10
Absolute temperature scale unit
Down
2
Biological catalyst
5
Smallest unit of an element
7
Preserved remains of ancient life
8
Nerve cell in the brain
9
Infectious microscopic agent