4. Sand is a type of soil best described as: a. mostly decayed matter with tiny rock particles. b. large rock particles and very little decayed matter. c. very small rock particles that hold water well. d. found only on beaches.

Shaken by the collapse of the steel industry, which had provided them with an unshakable sense of identity for more than a century, pittsburghers hunkered down and built a new economy based on services, medicine, education, and technology. in the process, they transformed their community from one driven by quantity of production into one devoted to quality of life. —peter miller, "pittsburgh: stronger than steel," national geographic, december 1991. the community remodeling carried out in pittsburgh was accomplished partly through the conversion of old factories for new uses—a process known as a. urban renewal. c. gentrification. b. retooling. d. urban pioneering.

What causes heat transfer in fluids

The inner planets mercury, venus, earth, and mars were formed by