Across
1
Biological catalyst
4
Unit of electric potential
5
Substance with pH above 7
8
Solid with repeating atomic pattern
9
Unit of energy
10
Push or pull on an object
11
Compound containing oxygen
Down
2
Center of an atom or cell
3
Gas essential for breathing
4
Hottest planet in solar system
6
Icy body with a tail near the sun
7
Blocking of light by a celestial body