What rock type would most likely be found in the location marked by the black rectangle in the diagram below?

Anybody wanna ? (picture included? )

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.