Across
1
Unit of power
3
Positive particle in nucleus
4
Basic unit of life
5
Blocking of light by a celestial body
6
Second lightest element
Down
2
Naturally occurring inorganic solid
3
Tectonic landmass section
7
Curved glass that refracts light
8
Precious yellow metallic element
9
Force that attracts objects together
10
Biological catalyst