Across
1
Second lightest element
4
Tissue that contracts for movement
6
Nerve cell in the brain
7
Positive particle in nucleus
8
Force that attracts objects together
9
Element found in all living things
10
Absolute temperature scale unit
11
Chemical element in table salt
14
Icy body with a tail near the sun
Down
2
Biological catalyst
3
Smallest unit of an element
5
Naturally occurring inorganic solid
6
Unit of force
12
Preserved remains of ancient life
13
Natural satellite of Earth