Across
1
Icy body with a tail near the sun
4
Push or pull on an object
5
Unit of heredity
6
Blocking of light by a celestial body
8
Nerve cell in the brain
9
Substance with pH below 7
12
Natural satellite of Earth
Down
1
Element found in all living things
2
Unit of power
3
Glass that splits light into spectrum
5
Precious yellow metallic element
7
Absolute temperature scale unit
10
Positive particle in nucleus
11
Magnetic metallic element