Studying earth sciences is one of the best subjects to study if you want to make direct contributions to the world and its wellbeing. However, the curriculum is no joke. You have to rigorously invest yourself in preparing for different exams and multiple assignments. To score well, one has to attend lectures and commit to rigorous research to find solutions to the assignments over the weekend.
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Let’s discuss the concepts required to answer the typical Soil Formation assignment one by one.
How does Soil Form at Different Places?
Soil is abundantly found all over the surface of the earth as a thin layer of debris or rock powder that got accumulated due to constant weathering and of the rocks by natural forces like climate, water and ageing. Primarily soil consists of mineral particles, organic matter and microorganisms living in it. The constituents of soil react slowly but constantly with the environment to change composition and foster life on the planet. Almost all of the plants get their nutrients from the soil and eventually support life on the planet earth.
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At different places, soil forms at the different composition to numerous geographical factors like the composition of the rock, temperature of the area and availability of flowing water in the area. Here is the list of factors affecting soil and rock formation:
Physical weathering :
Physical factors like mechanical action and natural forces break down rocks to fine dust over a period of million years. The forces like changes in Temperature, abrasion, and friction all-cause rocks to break down slowly and eventually form dust that settles down over the rocky land to form a layer of soil.
Chemical weathering:
Chemical composition in the rocks constantly changes due to changes in the environments. The change in the composition of rocks render them brittle and eventually leads to their degradation into finer particles. This process can be expedited when they react with water and other chemicals.
Biological Weathering:
Living things and organisms can also contribute to the breakdown of rocks, as the animals that burrow can help moisture get trapped in the rock and the plants can get roots to grow inside a rock eventually forcing them to crack open.
Discussing different types of Rocks and their Deformation
Sedimentary Rocks
Over time, these rocks form from the sediments or the pieces of other existing rocks or some organic material like coal. Even sedimentary rocks are of different types, namely; clastic, chemical and organic. Clastic rocks like sandstones are formed from the pieces of different rocks merging together. Organic rocks form from organic matter like coal, compounds of carbonate and other plant-like materials like cellulose, shells and bones. The organic material gets compressed due to the weight of the matter and fuses into rock over a period of years.
Weathering triggers the formation of organic and clastic rocks as the forces of nature break it down into fragments. Then, with the help of erosion, fragments spread over an area and the cycle of weathering and erosion repeats to form a layer of soil. Once the sediments from these rocks settle at the lowest layers over time the weight of the upper layers compresses them again to form solid rocks.
Metamorphic Rocks
These rocks are the types of stones and large pieces of inorganic mass that undergo immense heat and pressure to transform into metamorphic rocks. Metamorphic rocks can be further broken down to two-pieces, foliated and non-foliated. Under immense pressure, the elongated minerals stack up in layers all the way to the top which eventually creates follicles. During foliation, the elongated or platy minerals align in the direction of applied pressure. For example, mic and hornblende and granite align in the direction of pressure.
The non-foliated rocks also undergo the same conditions as immense heat and pressure during their process of formation, but they lack the presence of minerals. Thus, they do not form layered appearances. When sedimentary rocks like sandstone and limestone are put under enough heat and pressure, they turn into non-foliated metamorphic rocks like marble, quartzite and anthracite coal. Volcanic eruption and magma can also contribute to the formation of these rocks when it comes in contact with the surfaces of sedimentary rocks.
Igneous Rocks
Igneous rocks are formed when hot or molten material from the earth’s core oozes out to the surface of the earth and then cools down to form rocks. There are also a bunch of different ways to make igneous rocks, but all of them involve the molten rocks to be deposited over the surface. When they get formed inside the surface of the earth, they are named as intrusive igneous rocks. Similarly, when they form outside the crust, they are known as extrusive igneous rocks. Rocks like Granite and diorite are common examples of igneous rocks.
In the above part, we discussed the fundamental concepts that will help you in writing soil formation assignments. Mentioned below are the advanced concepts discussing seismic activities and the mechanism behind the formation of an earthquake. If you have been looking for some Soil and Water Science Assignment Help, then keep reading further.
What are Seismic Activities?
Seismic activities can be defined as the changes that occur beneath the surface of the earth like a shift in the tectonic plates or rise in pressure of the earth’s core. Earthquakes are caused because the rocks holding the tectonic plates beneath the crust of the earth break or drift apart suddenly. When two rocks rub against each other, they cause shock waves which is typically known as seismic activity. During an earthquake, the rocks start to move and they keep on moving until they lock each other again. The point where the rock first breaks is also called as the focus or the epicentre of the earthquake.
What Are Fault Lines?
Faults can be understood as the fractures in the earth’s crust where rocks slide past on either side of the crack. Often, the cracks are barely noticeable as they can even be as thin as a hair, sometimes, cracks can be as wide as 10 wide and up to 100 miles long. Some faults are even visible from space.
Primarily fault lines can be classified into three faults: Strike-slip fault, Normal Faults and Reverse Faults. Each of these faults is a result of different forces acting on each other.
Strike-slip faults
These kinds of fault lines are formed when rocks just slide past each other with very little vertical movement. For example the fault line in San Andreas.
Normal faults
These faults produce visible space between the pieces of crust that pull apart each other. For example, the Range Province of North America is famous for accommodating a recognized fault line.
Reverse faults,
Reverse faults are also popularly known as Thrust Falls. This happens when one block of crust blocks or drifts over the other block of crust. These faults form after collisions when tectonic plates collide and further push up the mountain ranges like the Himalayas.
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