Rock (geology) arkoses (12%). Sedimentary rocks often contain fossils. Sedimentary rocks form under the influence of gravity and typically are deposited in horizontal or near horizontal layers or strata and may be referred to as stratified rocks. A small fraction of sedimentary rocks deposited on steep slopes will show cross bedding where one layer stops abruptly along an interface where another layer eroded the first as it was laid atop the first. Metamorphic rocks are formed by subjecting any rock type—sedimentary rock, igneous rock or another older metamorphic rock—to different temperature and pressure conditions than those in which the original rock was
Heat of dilution The heat of dilution can be defined from two perspectives: the differential heat and the integral heat. The differential heat of dilution is viewed on a micro scale, which is associated with the process in which a small amount of concentrated solution is added to the mass dilute solution. The molar differential heat of dilution is thus defined as the enthalpy change caused by adding a mole of a concentrated solution at a constant temperature and pressure. Because of the small amount of addition, the concentration of dilute solution remains unchanged. Mathematically, the molar differential heat of dilution is denoted