Across
1
Path of a planet around the sun
4
Disturbance that transfers energy
5
Unit of heredity
6
Curved glass that refracts light
8
Second lightest element
Down
2
Icy body with a tail near the sun
3
Unit of force
7
Fourth state of matter
Path of a planet around the sun
Disturbance that transfers energy
Unit of heredity
Curved glass that refracts light
Second lightest element
Icy body with a tail near the sun
Unit of force
Fourth state of matter