Across
1
Reddish electrical conductor
2
Measure of matter in an object
4
Path of a planet around the sun
5
Infectious microscopic agent
6
Ball of burning gas in space
10
Naturally occurring inorganic solid
Down
2
The Red Planet
3
Blocking of light by a celestial body
7
Fourth state of matter
8
Chemical element in table salt
9
Substance with pH below 7