Across
1
Path of a planet around the sun
3
Substance with pH above 7
4
The Red Planet
6
Force that attracts objects together
7
Biological catalyst
9
Tissue that contracts for movement
Down
2
Mass per unit volume
4
Naturally occurring inorganic solid
5
Unit of electric potential
8
Reddish electrical conductor
10
Glass that splits light into spectrum
11
Amplified beam of light