Across
1
Particle of light
4
Solid with repeating atomic pattern
5
Measure of matter in an object
7
Preserved remains of ancient life
8
Tissue that contracts for movement
10
Biological catalyst
Down
2
Blocking of light by a celestial body
3
Element found in all living things
6
Hottest planet in solar system
9
Gas essential for breathing
11
Unit of power