Across
1
Preserved remains of ancient life
3
Element found in all living things
6
Path of a planet around the sun
8
Our home planet
9
Form of thermal energy
10
Tissue that contracts for movement
Down
2
Particle of light
4
Unit of power
5
Curved glass that refracts light
7
Force that attracts objects together
8
Blocking of light by a celestial body
9
Second lightest element