Across
1
Tissue that contracts for movement
3
Measure of matter in an object
4
Gas essential for breathing
5
Positive particle in nucleus
7
Blocking of light by a celestial body
8
Center of an atom or cell
10
Precious yellow metallic element
Down
1
Naturally occurring inorganic solid
2
Solid with repeating atomic pattern
4
Compound containing oxygen
6
Unit of force
9
Icy body with a tail near the sun