Describe the three major groups of igneous rocks. what are ultramafic rocks?

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.