Across
1
Glass that splits light into spectrum
3
Measure of matter in an object
5
Biological catalyst
6
Element found in all living things
7
Precious yellow metallic element
8
Hottest planet in solar system
Down
1
Tectonic landmass section
2
Smallest unit of an element
4
Amplified beam of light
5
Blocking of light by a celestial body
9
Nerve cell in the brain