Across
1
The Red Planet
4
Smallest unit of an element
5
Our home planet
7
Nerve cell in the brain
9
Preserved remains of ancient life
Down
2
Form of thermal energy
3
Mass per unit volume
6
Basic unit of life
8
Curved glass that refracts light
The Red Planet
Smallest unit of an element
Our home planet
Nerve cell in the brain
Preserved remains of ancient life
Form of thermal energy
Mass per unit volume
Basic unit of life
Curved glass that refracts light