Across
1
Infectious microscopic agent
2
Biological catalyst
3
Disturbance that transfers energy
7
Substance with pH above 7
8
Glass that splits light into spectrum
9
Path of a planet around the sun
Down
2
Blocking of light by a celestial body
3
Unit of power
4
Element found in all living things
5
Chemical element in table salt
6
Our home planet
8
Fourth state of matter