Across
1
Group of similar cells
3
Element found in all living things
5
Blocking of light by a celestial body
6
Biological catalyst
7
Glass that splits light into spectrum
Down
2
Second lightest element
3
Solid with repeating atomic pattern
4
Absolute temperature scale unit
8
Nerve cell in the brain
9
Gas essential for breathing
10
Hottest planet in solar system
11
Gas form of a liquid