Across
1
The Red Planet
3
Curved glass that refracts light
4
Mass per unit volume
5
Second lightest element
8
Positive particle in nucleus
9
Force that attracts objects together
10
Solid with repeating atomic pattern
Down
1
Molten rock beneath Earth surface
2
Blocking of light by a celestial body
6
Icy body with a tail near the sun
7
Infectious microscopic agent