Much of the bedrock in virginia's piedmont region, originally formed by cooled magma, has re-crystallized under a great deal of heat and pressure. one likely rock found here would be a) gneiss. b) halite. c) limestone. d) sandstone.

The correct answer is - A) gneiss.

Because the bedrock has re-crystallized because of high pressures and temperatures deep into the ground, that means that we can expect metamorphism to have occurred in the area. The metamorphic rocks are rocks that initially have been igneous or sedimentary, but because they were exposed to high temperatures and pressures deep into the ground, they start to change their structure, and eventually become new, metamorphic rocks.

In this case, we have igneous rocks that have been exposed to high pressure and temperatures, most likely granite. That would mean that we can expect to find the metamorphic rock gneiss in the area, as it is the one that forms from granite that has been exposed to high temperatures and pressures in the ground.