Across
1
Particle of light
3
Unit of energy
6
Unit of power
8
Absolute temperature scale unit
9
Substance with pH below 7
10
Tissue that contracts for movement
12
Path of a planet around the sun
Down
2
Group of similar cells
4
Positive particle in nucleus
5
Blocking of light by a celestial body
7
Unit of heredity
10
Measure of matter in an object
11
Naturally occurring inorganic solid
13
Reddish electrical conductor