Quartz sandstones commonly are only partly cemented and contain a high volume of pore space. would quartz sandstone be a good supplier of groundwater? shale has a high porosity; would it have a high permeability? how does shale differ from sandstone as a supplier of groundwater?

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

What does 2[tex] {2}^{ - 4} \times {2}^{ - 2} [/tex]

Hurry on the map above, arrow 1 points to a region where most people are