Across
1
Preserved remains of ancient life
4
Tissue that contracts for movement
5
Solid with repeating atomic pattern
6
Element found in all living things
8
Gas essential for breathing
9
Blocking of light by a celestial body
13
Substance with pH below 7
Down
2
Naturally occurring inorganic solid
3
Unit of force
4
Molten rock beneath Earth surface
7
Magnetic metallic element
8
Compound containing oxygen
10
Path of a planet around the sun
11
Infectious microscopic agent
12
Unit of energy