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High temperature and moderate to low pressure is needed. It partly depends on the rock, the high temperature, and the time duration of the exposure. This is unfortunate because it obscures the role of water in the weathering processes [“reverse” of reaction (3)] that occur at atmospheric pressure and ambient surface temperature. If continents are moved to high latitudes, more ice sheets form and sea levels fall. What causes shale to change into slate? The arrows represent the pressure and temperatures that cause the formation of metamorphic rocks. Change in the rate of tectonic activity causes changes in the amount of volcanism, and volcanoes influence the climate . Foliated metamorphic rocks are formed within the Earth's interior under extremely high pressures that are unequal, occurring when the pressure is greater in one direction than in the others (directed pressure). Nonfoliated = metamorphic rocks that are formed under high temperature, and LOW PRESSURE. 1. On the rock - if it is porous, then it will have a fairly high water content. The growth of mountain ranges affects atmospheric circulation patterns and the number of alpine glaciers. How do tremendous pressures and high temperatures affect limestone? Hornfels, with its alternating bands of dark and light crystals is a good example of how minerals rearrange themselves during metamorphism. In this case, the minerals separated by density and became banded. What happens to the slate if these conditions increase? The limestone turns into marble because of the tremendous pressures and high temperatures. Heat source: We already know that geysers occur in areas of high geothermal activity, but where does that energy come from? Regional Metamorphism When high temperature and pressure affect large regions of the Earth's crust; causes large-scale metamorphic change, results from building of mountains, happens in low, mid, and high grade. How do tremendous pressures and high temperatures affect limestone? Many people have marble tile in their homes, but they might not realize that marble was once a different type of rock -- marble formed from the metamorphism of limestone. What are gneiss and schist? 2. This mineral lining is crucial to the geyser's formation, as geysers operate under tremendous pressure and the plumbing system must be able to contain this pressure for the geyser to function. This contrasts with the high pressure and temperature conditions required for metamorphism. The Process of Changing a Rock by Extreme Heat & Pressure. Pressure is uneven. Gneiss forms by regional metamorphism from both high temperature and pressure. Experiments with ten groups of limestone specimens (four samples per group) under ten specific temperatures, 25 °C, 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, and 900 °C, show that the high-temperature effect on the elastic modulus of rocks conforms to thermoelastic responses with a quadratic temperature function. Answer the following questions on a separate sheet of paper. The effect of temperature on capillary pressure is one of several fascinating problems unearthed by J.R. Philip during his long career. The term “metamorphism” comes …

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