preview

Insulation and Influences

Satisfactory Essays
1. Factors that cause metamorphism are heat, pressure, and moisture. All of these three factors are important for regional metamorphism. The degree of regional metamorphism is impacted by the amount of heat, pressure, and fluids or gases to which the rock is exposed. These factor may occur in any combination. For example, a mass of rock may first undergo high pressure and moderate temperatures, and then be vulnerable to low pressure and high temperatures. Regional metamorphism occurs as mountain form and are subjected to high heat and pressure. Earth’s internal heat causes temperature to increase with depth. Overlying rock contributes to high pressure. Minerals in the rock align in layers when the pressure is stronger in one direction. This process can be speeded up with the help of hot liquids and gases in the deep rocks. The two types of local metamorphism (contact and deformational) are also affected by certain factors. Contact metamorphism occurs when hot magma heats and changes rock. Hot gases and liquids from the magma may also enter the intruded rock. Deformational metamorphism occurs at low temperatures and at high pressures caused by friction and stress. Heat from the pressure, friction, and stress cause the rock to change shape. The modified rocks generally have a mineral composition akin to their surrounding rocks. However, the altered rocks still exhibit changes in texture and structure.

2. Two examples of nonfoliated rocks are quartzite and marble. Foliation occurs when a rock is composed of several minerals with various melting points. When the rock is heated, minerals migrate throughout the rock. Bands are formed when the rock cools. Foliation also happens when a rock is compressed from one direction and partially ...

... middle of paper ...

...rocks is the most complex since it involves the most steps. Any igneous, sedimentary, or metamorphic rock can become a sedimentary rock if it goes through the following process: uplift, weathering and erosion, turning into sediments, deposition, burial and compaction, and cementation. The number of steps involved here blatantly outnumbers the formation processes of other rocks.

5. Certain properties of marble make it good for sculpting. Marble is a metamorphic rock derived from limestone. It is composed chiefly of calcite. Marble is relatively soft and easy to work, refine, and polish. As the finished marble ages, it becomes harder and more durable. Marble’s translucency and fine-grained structure makes it a better choice than limestone. The fineness of marble’s grain enable the sculpture to create minute detail better. In addition, marble is more weather-resistant.