Across
1
Basic unit of life
3
Path of a planet around the sun
4
Second lightest element
5
Amplified beam of light
6
Blocking of light by a celestial body
9
Chemical element in table salt
10
Fourth state of matter
Down
1
Reddish electrical conductor
2
Naturally occurring inorganic solid
7
Tissue that contracts for movement
8
Smallest unit of an element