Across
1
Measure of matter in an object
2
Amplified beam of light
3
Hottest planet in solar system
5
Molten rock beneath Earth surface
6
Center of an atom or cell
7
Compound containing oxygen
Down
1
Naturally occurring inorganic solid
2
Curved glass that refracts light
3
Infectious microscopic agent
4
Chemical element in table salt
8
Form of thermal energy
9
Smallest unit of an element