Metamorphic Rocks

Next, we can see that the rock displays a subtle porphyritic texture with plagioclase comprising the phenocrysts. The overall texture of the surrounding groundmass is granoblastic equigranular. Under thin section we also see a weakly defined foliation evidenced in the preferential alignment of actinolite grains and to a lesser extent chlorite grains. Undulose extinction is also observed in quartz indicating the rock was subject to deformation. The normalized quartz, alkali-feldspar, and plagioclase (QAP) values of this rock indicate that it is classified as a grano-diorite according to the IUGS QAPF classification system which is consistent with the hand sample interpretation.

This newly exposed rock already had small cracks - weathering and erosion took full advantage of these. Water would creep in and the freeze - thus expanding. This expansion would create more cracks. Wind and water eroded by carrying away particles from cracks like these, as well as from the surface of the rock and any other nooks. Not only did water wash particles away - it also softened the rock which made erosion easier.

Some rock’s in the Earth’s interior that are solid, are so hot that, if the pressure on these were released, or they are convected into a lower pressure zone, they could begin to melt

Initially, earthquakes shape the Earth’s surface by creating mountains and geysers. In the article “Historic Earthquakes,” it reads, “High intensities were observed in the northwest section of Yellowstone National Park. Here, new geysers erupted, and massive slumping caused large cracks in the ground from which steam emitted” (Stover 3). Consequently, when the geo-process of earthquakes occurs, it molds and changes the earth by creating new geothermal

Metamorphic rocks are the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in

A mineral is a naturally substance that happens, in this process an inorganic material creates a solid crystal like material that has a specific chemical composition. All the matters that make up a mineral are natural and made up from the earth and do not have living matter in them. The structure makes it three dimensional, which means that it has a particular shape that repeats itself. Now compared to a rock, which is also an inorganic material, however it has not certain atomic structure compared to minerals. Rocks are made up of several different minerals, which have been “stuck” together in a geological process that formed

Convection currents may bring magma to the surface at diverging boundaries. Sedimentary rocks from the ocean floor gets pushed down to the mantle at convergent boundaries. The crust soon melts and rises to the surface creating igneous rock. Typically mountain ranges are metamorphic rock, maybe our mountains are.

The Granite rock is an intrusive rock that formed from magma coming from beneath the earth’s surface. It went through a slow cooling process that allowed the minerals; mainly quartz and feldspar to form where the result is the coarse texture. The granite went through hydrothermal metamorphism (involves hot fluid) and contact metamorphism. The gneiss, however, being able to withstand high temperatures came from a large country rock. This piece of gneiss broke off from the country rock and got trapped in between as the granite cooled. The gneiss then became the xenolith. This shows that the granite is the younger rock and the gneiss the older. The striations on the Gneiss were caused by faults. A slick-en- side fault caused the horizontal striations

The Grand Canyon’s display of layered rocks is magnificent and immense. The Canyon has many types of rocks including metamorphic, igneous and sedimentary. 2 billion years ago, igneous and metamorphic rocks formed in the inner gorge of the Grand Canyon. On top of these rocks sedimentary rock layers were created. Over time these layers of rocks transformed with erosion, tectonic actions, intrusions, and uncomformities.

Metamorphic rocks change based upon heat, pressure, and chemical processes. Sedimentary rocks change into metamorphic rocks by withstanding heat, pressure, or by chemical action. Igneous rocks change by weathering and erosion. Metamorphic rocks can change into igneous rocks by experiencing melting and cooling. Sedimentary rocks change by weathering and erosion. Sedimentary rocks are formed by the accumulation of sediments and other fragments. When utilizing the rock cycle igneous rocks can change into both sedimentary rocks and metamorphic rocks when experiencing weathering and erosion. Igneous rocks are formed from the volcanic magma that cools and hardens on the surface of the earth.

An eruption of a volcano is one phenomenon that occurs in nature. Deep within the Earth, it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Because it is lighter than the rock around it, magma rises and collects in magma chambers. Eventually some of the magma pushes through vents and fissures in the Earth 's surface. This is how a volcanic eruption occurs. Magma that has erupted is called lava.

In the beginning of my life, I was created by the slow crystallization of magma below the Earth’s surface. My rock type can come in different colors including red, pink, gray, or white. I am a gray color with some white and black. I, a granite rock, am the most known type of igneous rock.

As a tectonic plate slides into the mantle, the heat releases fluids trapped in the plate. Seawater and carbon dioxide, rise into the upper plate and can partially melt the overlying crust, forming magma. And magma most likely means volcanoes are around.

     Metamorphic rocks are pre-existing rocks that are changed by heat and pressure. The pre-existing rock is called the parent rock, or protolith. Metamorphism occurs in these rocks when the minerals become instable. There are two types of metamorphism, contact and regional. Contact is high temperature, low pressure. It is basically a massive rock that is baked. Regional is high pressure and low temperature. Strong fabric, or layering, develops from

The word Marble comes from Greek word “Mamaros” which means shining stone Marble is a non-foliated, Granular Metamorphic Rock that is formed by the Metamorphism of Limestone and Dolostone.