Across
1
Substance with pH above 7
3
Mass per unit volume
6
The Red Planet
7
Reddish electrical conductor
8
Unit of force
9
Glass that splits light into spectrum
Down
2
Preserved remains of ancient life
4
Element found in all living things
5
Blocking of light by a celestial body
8
Nerve cell in the brain
9
Tectonic landmass section