Across
1
Second lightest element
4
Unit of force
6
Nerve cell in the brain
7
Tissue that contracts for movement
10
Gas form of a liquid
11
Basic unit of life
12
Form of thermal energy
13
Precious yellow metallic element
Down
2
Absolute temperature scale unit
3
Force that attracts objects together
5
Blocking of light by a celestial body
8
Gas essential for breathing
9
Positive particle in nucleus