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 capacity ratio Heat capacity ratio In thermal physics and thermodynamics, the heat capacity ratio or adiabatic index or ratio of specific heats or Poisson constant, is the ratio of the heat capacity at constant pressure () to heat capacity at constant volume (). It is sometimes also known as the "isentropic expansion factor" and is denoted by (gamma) for an ideal gas or (kappa), the isentropic exponent for a real gas. The symbol gamma is used by aerospace and chemical engineers. where is the heat capacity, and the specific heat capacity (heat capacity per unit mass) of a gas. The suffixes and