Across
1
Gas essential for breathing
4
Measure of matter in an object
5
Blocking of light by a celestial body
8
Molten rock beneath Earth surface
9
Positive particle in nucleus
10
Unit of power
Down
2
Element found in all living things
3
Reddish electrical conductor
6
Form of thermal energy
7
Force that attracts objects together
11
Nerve cell in the brain