Across
1
Molten rock beneath Earth surface
4
Tissue that contracts for movement
5
Preserved remains of ancient life
7
Path of a planet around the sun
8
Chemical element in table salt
11
Blocking of light by a celestial body
Down
2
Glass that splits light into spectrum
3
Substance with pH above 7
4
Measure of matter in an object
6
Group of similar cells
9
Precious yellow metallic element
10
Icy body with a tail near the sun
12
Infectious microscopic agent