Across
1
Unit of heredity
4
Mass per unit volume
5
Ball of burning gas in space
6
Molten rock beneath Earth surface
8
Hottest planet in solar system
9
Infectious microscopic agent
10
Gas form of a liquid
Down
1
Force that attracts objects together
2
Form of thermal energy
3
Substance with pH above 7
6
Measure of matter in an object
7
Nerve cell in the brain