Across
1
Second lightest element
4
Solid with repeating atomic pattern
5
Disturbance that transfers energy
7
Unit of force
11
Glass that splits light into spectrum
12
Precious yellow metallic element
Down
2
Gas essential for breathing
3
Tissue that contracts for movement
6
Naturally occurring inorganic solid
7
Nerve cell in the brain
8
Unit of energy
9
Blocking of light by a celestial body
10
Fourth state of matter