Across
1
Measure of matter in an object
3
Icy body with a tail near the sun
5
Unit of energy
9
Element found in all living things
10
Force that attracts objects together
11
Unit of heredity
Down
2
Biological catalyst
4
Smallest unit of an element
6
Substance with pH above 7
7
Unit of electric potential
8
Curved glass that refracts light