Across
1
Mass per unit volume
3
Basic unit of life
4
The Red Planet
6
Disturbance that transfers energy
7
Substance with pH below 7
Down
2
Curved glass that refracts light
3
Solid with repeating atomic pattern
5
Second lightest element
Mass per unit volume
Basic unit of life
The Red Planet
Disturbance that transfers energy
Substance with pH below 7
Curved glass that refracts light
Solid with repeating atomic pattern
Second lightest element