Across
1
Preserved remains of ancient life
4
Force that attracts objects together
5
Mass per unit volume
6
Basic unit of life
9
Substance with pH above 7
10
Form of thermal energy
Down
1
Push or pull on an object
2
Blocking of light by a celestial body
3
Curved glass that refracts light
7
Absolute temperature scale unit
8
Tectonic landmass section
11
Path of a planet around the sun