Across
1
Substance with pH below 7
4
Substance with pH above 7
6
Preserved remains of ancient life
7
Blocking of light by a celestial body
8
Smallest unit of an element
Down
2
Disturbance that transfers energy
3
Compound containing oxygen
5
Force that attracts objects together
9
Absolute temperature scale unit
10
Measure of matter in an object
11
Element found in all living things