Across
1
Curved glass that refracts light
4
Gas form of a liquid
6
Path of a planet around the sun
7
Preserved remains of ancient life
8
Smallest unit of an element
9
Biological catalyst
11
Icy body with a tail near the sun
Down
2
Hottest planet in solar system
3
The Red Planet
5
Naturally occurring inorganic solid
7
Push or pull on an object
10
Chemical element in table salt