Across
1
Molten rock beneath Earth surface
3
Blocking of light by a celestial body
6
The Red Planet
9
Preserved remains of ancient life
10
Unit of energy
12
Smallest unit of an element
Down
2
Solid with repeating atomic pattern
4
Icy body with a tail near the sun
5
Compound containing oxygen
7
Path of a planet around the sun
8
Reddish electrical conductor
11
Curved glass that refracts light
13
Hottest planet in solar system
14
Form of thermal energy