There are three different types of rocks. We should know about
• Igneous
• Sedimentary
• Metamorphic
Sedimentary rocks are made of fragments of other rocks; igneous, metamorphic or sedimentary. They are made when an older rock erodes or weathers to produce sediment, for instance sand on a beach. The sediment is then compacted and cemented together to produce a rock. Sedimentary rocks can also contain individual grains of minerals which have been eroded out of older rocks.
Igneous rocks are formed from the cooling of magma - molten rock. They are the rocks that form from volcanoes.
Metamorphic rocks are a result of heat and pressure on pre-existing rocks which undergo changes in the solid state. No melting occurs. They are associated with mountain
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A large portion of the granite is made of small crystals of orthoclase feldspar which give the rock the pink or reddish colour. Other minerals present are quartz (usually gray). albite feldspar (white) and either white mica (muscovite) or black mica (biotite). The word granite means grain-rock, it weathers, and it crumbles into loose grains.
7. Diorite Diorite is a coarse-grained igneous rock intermediate in composition between granite and gabbro. It can sometimes be described as a "white granite" because of the abundance of albite, a white feldspar. Depending upon the amount of iron rich minerals present, diorite can range from nearly white to quite dark. Diorite has the same mineral content as andesite.
8. Gabbro Gabbro is a dark, coarse-grained igneous rock. It has the same mineral content as basalt, but the grains in gabbro are visible to the naked eye.
9. Porphyry The term porphyry simply refers to the two distinctly different grain sizes present in an igneous rock. The larger crystals are called phenocrysts and the finer crystals are the groundmass. The groundmass can be rhyolite, andesite, or basalt and even, rarely, granite. The phenocrysts are often feldspar crystals or hornblende crystals.
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They are layered accumulations of sediments-fragments of rocks, minerals, or animal or plant material. Temperatures and pressures are low at the Earth's surface, and sedimentary rocks show this fact by their appearance and the minerals they contain. Most sedimentary rocks become cemented together by minerals and chemicals or are held together by electrical attraction; some, however, remain loose and unconsolidated. The layers are normally parallel or nearly parallel to the Earth's surface; if they are at high angles to the surface or are twisted or broken, some kind of Earth movement has occurred since the rock was formed. Sedimentary rocks are forming around us all the time. Sand and gravel on beaches or in river bars look like the sandstone and conglomerate they will become. Compacted and dried mud flats harden into shale. Scuba divers who have seen mud and shells settling on the floors of lagoons find it easy to understand how sedimentary rocks
...e morphed it into the quartzite that is seen surrounding the butte (4). Rocks that undergo this process are called metamorphic rock, which is the same as the rock seen years ago by dinosaurs and other extinct creatures. The quartzite rocks were formerly seafloor sediment that was forced upwards, and then surrounded by lava basalt flows. Once erupted through fissures and floods through out most of the area, lava flow eventually created enough basalt to form a thickness of about 1.8 kilometers (1). All of this basalt flow eventually led to the covering of most mountains, leaving the buttes uncovered. The igneous lava flows and loess is reasons that the Palouse consists of such sprawling hills, and rich soil for farming (2). In result of the lava flows, the Precambrian rock Quartzite was formed. And lastly covered by the glacial loess, which were carried by the wind.
Tarbuck E., Lutgens F., Tasa D., 2014, An Introduction to Physical Geology, 5th Ed, Pearson Education, Upper Saddle River, New Jersey.
Shown in the picture above is volcanic extrusive igneous rock known as andesite. They were imported here to Laguna Beach to help minimize erosion (Merton Hill, p. 10-11). Extrusive Igneous rocks are formed on Earths surface due to lava quickly cooling or mixing with different materials such as ash or cinders from an eruption. There are two different types of extrusive igneous rocks; Plutonic and Volcanic. Andesite is known for being gray in color and being made up of very coarse grainy textures, which make it much harder to break down than sedimentary rocks. Unlike loose gravel and other sediments igneous rocks are known for being able to slow down seismic waves from earthquakes which cause less damage to surface structures.
Froede, Carl R. “Stone Mountain Georgia: A Creation Geologist's Perspective.” CRS Quartely 31, no. 4 (March 1995): 6.
A gallstone is a stone about the size of a pea, or marble which is made
"Sedimentary Rocks." Backyard Nature with Jim Conrad. N.p., 18 May 2015. Web. 25 Oct. 2015.
“Table rock is a conglomerate composed of olivine, augite, andesine, labrodorite, magnetite, hematite, apatite and orthopyroxine. Table rock is a geologist’s classroom as the lava caps display irregular column jointing and uneven displacement” (Lorenz, 1970).
Basalt forms due to the partial melting of the layer of the mantle called the asthenosphere. The asthenosphere is the plastic zone of the mantle beneath the rigid lithosphere. Mantle plumes coming from the mesosphere can cause the asthenosphere to melt with heat or even if pressure decreases, which is called decompression melting (Richard 2011). The magma that forms from this melting is mafic magma that solidifies once it reaches the earth’s surface and cools quickly. The above process mainly occurs mainly during intraplate igneous activity which is the main explanation for volcanic activity that occurs a long distance away from a plate boundary. If the tectonic plate above the mantle plume is moving it can create a string of volcanic activity such as in Hawaii. See Fig 2.
On the outside it looks like a stereotypical rock, but on the inside you don't really know whether it's actually a rock or a crystal. You need to be open minded and willing to find out.
...These rocks include indurated conglomerates, coarse-grain granites, and Arkosic and breciated granites. Furthermore, there are evidences to indicate that faulting took place in the area. Hydrothermal and epithermal action must have intruded the rocks in the Goldfield area forming small stringers of quartz. There are also evidences of sedimentary rocks such as sandstones, limestone and conglomerates found near Roosevelt Lake (Eppinga, 2006).
The geologic history of the Rocky Mountains has come about as an aggregation of millions of years. Briefly speaking, the formation of the Rockies transpired from hundreds and millions of years of uplift by tectonic plates and millions of years of erosion and ice have helped sculpt the mountains to be what we see today. The majority of the rocks that make up the Rocky Mountains began as simple shale, siltstone, and sandstone accompanied by smaller amounts of volcanic rock which formally built up for approximately 1.8 to 2 billion years in the ancient sea. By 1.7 to 1.6 billion years, these sedimentary rocks got caught in the zone of collision between parts of the earth’s crust and its tectonic plates. The incredible heat at the core of the mountain range then recrystallized the rock into metamorphic rock by the heat and pressure of the collision forces. Eventually, the shale would be transformed into both schist and gneiss. It is believed that granite found in the Rocky Mountain parks came from pre-existing metamorphic rock created shortly after the formation of the earth. Ultimately, the high mountains of the period were slowly eroded away to a flat surface exposing metamorphic rocks and granite. This process occurred around the period of 1,300 to 500 million years ago. This flat surface would become covered with shallow seas and rocks from the Paleozoic period and would be deposited and eventually cover the surface. There is...
Magma is a hot liquid made of melted minerals. Minerals can form crystals when they are cool. Igneous rock can form underground, where the magma cools. slowly. Or, igneous rock can form above ground, where the magma cools.
Feldspar and Olivine are two silicate minerals commonly found on the Earth’s surface, their chemical formulas are KAlSi3O8 – NaAlSi3O8 –CaAl2Si2O8 for feldspars and (Mg, Fe)2SiO4 for olivine. Olivine is a nesosilicate, whereas feldspars are a group of tectosilicates, both minerals are anhydrous, since they contain no water in their chemical structure. Feldspars hold differing quantities of different elements, such as potassium, calcium, and sodium; making them classifiable in terms of composition, for instance, NaAlSi3O8 is Albite, while CaAl2Si2O8 is referred to as Anorthite.
As the crust cracks, blocks of rock rise or fall, forming fault-block mountains. Examples of these mountains are the Sierra Nevada in California and the Grand Tetons in Wyoming. Dome mountains are formed by the same kind of molten rock that forms volcanic mountains. As magma comes up in a crack in the Earth’s crust, it does not come to the surface, but the molten rock pushes the ground up into a dome. Examples include Yosemite’s Half Dome, the Adirondacks in New York, and the Black Hills in South Dakota.