Over long periods of time, a series of processes continuously change rocks from one type into another. This is called the rock cycle. A combination of subsurface and surface processes are responsible for the recycling of rocks in the geosphere.(that was the story) What two processes are responsible for changing metamorphic and igneous rock into sedimentary rock?(this is the question)
A) intrusive and extrusive
B) weathering and erosion
C) subduction and sea floor spreading
D) heat and pressure

In an energy pyramid, which level has the most available energy?

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both