Across
1
Substance with pH above 7
3
Center of an atom or cell
6
Unit of force
8
Biological catalyst
10
Form of thermal energy
13
Glass that splits light into spectrum
Down
2
Unit of heredity
4
Absolute temperature scale unit
5
Smallest unit of an element
7
Blocking of light by a celestial body
9
Particle of light
11
Natural satellite of Earth
12
Our home planet