Explain how an intrusive igneous rock could become a metamorphic rock and then an extrusive igneous rock.
*how can an igneous rock become a sedimentary rock?
how does the rock cycle display the law of conservation of mass?
*what determines the size of mineral grains in igneous rocks?
what will determine if a rock becomes an igneous rock or a metamorphic rock?
what is the difference between weathering and erosion?
starred(*) questions are the ones i need with the most.

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of where qin is the refrigerator cooling rate, qout is the heat rejection rate, and is the power input. show that copm can be expressed in terms of the reservoir temperatures tc and th, the cold and hot thermal resistances rt,c and rt,h, and qin, as where rtot rt,c rt,h. also, show that the power input may be expressed as 1.39 a household refrigerator operates with cold- and hot-temperature reservoirs of tc 5 c and th 25 c, respectively. when new, the cold and hot side resistances are rc,n 0.05 k/w and rh,n 0.04 k/w, respectively. over time, dust accumulates on the refrigerator’s condenser coil, which is located behind the refrigerator, increasing the hot side resistance to rh,d 0.1 k/w. it is desired to have a refrigerator cooling rate of qin 750 w. using the results of problem 1.38, determine the modified coefficient of performance and the required power input w under (a) clean and (b) dusty coil conditions. internally reversible refrigerator qout qin w high-temperature reservoir low-temperature reservoir th th,i tc,i tc high-temperature side resistance low-temperature side resistance w qin th tc qinrtot tc qinrtot copm tc qinrtot th tc