Across
1
Preserved remains of ancient life
4
Hottest planet in solar system
5
Smallest unit of an element
6
Gas form of a liquid
8
Biological catalyst
13
Precious yellow metallic element
14
Magnetic metallic element
15
Unit of energy
Down
2
Positive particle in nucleus
3
Naturally occurring inorganic solid
7
Reddish electrical conductor
9
Our home planet
10
Mass per unit volume
11
Disturbance that transfers energy
12
Tissue that contracts for movement