Mafic: Igneous rocks that are rich in dark Plagioclase feldspar, pyroxene and that are dark in their color.…
| Plate tectonics play a major role in the origin of igneous rocks. Igneous rocks are called fire rocks and are formed either|…
Extrusive rocks are also called volcanic rocks and extrusive rocks are formed on the earth’s surface. Extrusive rocks also form from magma, but a form of lava. Magma flows onto the earth’s surface by an eruption by a volcano. When the magma hits the earth’s surface, the magma turns into lava. Extrusive rocks are formed by lava, and the lava will harden quickly and crystallize quickly, either by hot spots or on the earth’s surface. Igneous rocks are considered felsic, intermediate, mafic, and ultramafic. Felsic rocks are high in silica, and usually light colored, and an extrusive rock, which is felsic, is rhyolite. Intermediate rocks are…
An effusive eruption occurs when the magma feeding the volcano is hot and mafic causing it to have low viscosity. An explosive eruption occurs when pressure builds in a volcano. It may be a small explosion like a basaltic eruption where the gas builds up and suddenly escapes or it can be a large explosion which can be triggered by many things, such as cracks in the flank of an island volcano where water enters the magma chamber and turns to steam, or if a very viscous magma plugs the vent and the pressure increases so much it cracks parts of the volcano and…
Crust: Earth’s outer most layer 2typesContintinential: thick w/silicon,aluminum-Oceanic crust:Thin denser w/ dark igneous rocks (basalt/gabbro)…
The rock cycle is something that a lot of people know. There are a lot of different versions. Some are more complicated than others(OI). The rock cycle can take thousands of years to complete(OI)! Every rock can turn into another rock from every stage(Doc.1). Geology is not just studying boring rocks. There is a lot more to it. You can study rocks to find out how old the rock is or even how old the earth is. You could be the person to find out how long ago a dinosaur by what rock the bones were in. Or maybe you find a fossil of a new type of animal and the rocks can tell you when it lived. Rocks can be a whole lot more exciting than you ever thought.…
The source magma of this volcano is classified as acidic, having high to intermediate levels of silica (as in rhyolite, dacite, or andesite).…
Sedimentary rocks are formed on or near the surface of the earth. They develop in layers called strata these are formed by compressed sediments or fragments and often form on lakebeds or under the sea. Successive layers of strata are separated by bedding planes. Sedimentary rocks are generally divided into 2 categories:…
Volcanoes are formed on land near coastal areas when a continental plate and an oceanic plate converge. The oceanic plate submerges, due to its higher density, and is pushed deeper and deeper beneath the surface. The high temperature and pressures below melt the rock which creates hot, buoyant magma. Ultimately this magma rises towards the surface and accumulates in a reservoir, known as the magma chamber. The eruption occurs when the pressure within in the chamber surpasses the pressure of the upper rock, magma forces its way through the cracks in Earth’s crust. Magma that is low in gas and silicon dioxide produces thin quickly spreading lava which has a low viscosity, while a magma that is heavily composed of gas and silicon dioxide will yield a thick, viscose magma. The thicker magma builds up and because of this pressure, will cause a large…
They use a seismograph to record seismic waves and use the S-P time method to figure out the epicenter.…
•Molten rock below the surface of the Earth that rises in volcanic vents is known as magma, but after it erupts from a volcano it is called lava…
5. What is the difference between a rock and a mineral? A rock is an aggregate of minerals. Minerals are naturally occurring, inorganic, crystalline solids that have definite physical and chemical properties.…
Yosemite National Park is without a doubt, one of America’s most beautiful and well-known parks. Due to the diversity of attractions the park offers, including high Sierra Peaks, the highest highway pass in California called the Tioga Pass, the Yosemite Valley, the Merced River, acres of high altitude backcountry, waterfalls, and some of the largest living things on earth in the sequoia groves tourists from all over the world visit. The most famous section in the park is Yosemite Valley, where El Capitan, Half Dome, Yosemite Falls, and other places to explore nature’s beauty lie.…
The election system for a president and a vice president in the United States of America depends on only 538 persons who are members of the Electoral College system. Technically, the Electoral College members , called Electors, have the right to choose the president and the vice president with their decisions. In spite of making their own decisions, the Electoral College members who are voted by people in their states use the results of popular votes in their states to make conclusions in choosing for the president and the vice president. Moreover, It is important to make sure that people who are going to choose the USA’s leaders have enough knowledge of the candidates’ dispositions and backgrounds that they can make good decisions. In contrast, the result of an election sometimes does not reflect the vote of the vast majority of the people in the nation. From my point of view, the Electoral College should be abolished and the result form the citizens popular vote should be used to elect a president and a vice president of the people.…
The principle visual difference between Shield volcanos and Stratovolcanoes is the shape, which is due to the composition of the magma. The Magma in most shield volcanos is basaltic and far less viscous than that in Stratovolcanoes. A shield volcano consists of a Caldera, central vent and magma reservoir while occasionally there are side vents or fissures. The caldera, which is Spanish for cauldron is at least a mile in diameter and is a depression in the cone of the volcano. It is built out of the substance of the Magma and is generally the source of most eruptions.…