please answer!! (I asked this before but the bots got to it :|) Porosity is the fraction of material occupied by empty spaces. It can be expressed as a percent or a decimal. Assume that the porosity of a sample of sand and a sample of gravel is the same: 30 percent (0.30). Determine the porosity of a mixture of the sand and gravel, assuming that the sand fills the spaces between the gravel.

Northern was a learned a fairly cold climate caused by see one from the atlantic ocean, but se was real and tends to be much warmer, sonia look good causes difference. a.cool wins cannot blow across a leg into the south mountains, b.prevent cold air from blowing over into south sea,c.the south is at much higher elevation, so it is closer to the sun, d.suppose early and has a sperience a drastic climate change in the past few years.