Across
1
Basic unit of life
3
Reddish electrical conductor
5
Substance with pH above 7
7
Magnetic metallic element
9
Smallest unit of an element
11
Gas essential for breathing
12
Naturally occurring inorganic solid
Down
2
Blocking of light by a celestial body
3
Element found in all living things
4
Glass that splits light into spectrum
6
Tissue that contracts for movement
8
Form of thermal energy
10
Biological catalyst