Across
1
Blocking of light by a celestial body
4
Unit of force
5
Smallest unit of an element
9
Hottest planet in solar system
12
Biological catalyst
14
Second lightest element
Down
2
Tissue that contracts for movement
3
Disturbance that transfers energy
6
Unit of power
7
Infectious microscopic agent
8
Nerve cell in the brain
10
Unit of heredity
11
Chemical element in table salt
13
Molten rock beneath Earth surface