MEV 012 Solved Assignment 2021-22

MEV 012 Solved Assignment 2021-22: MEV 012 Solved Assignment 2021-22 MEV 012 Assignment 2021-22 All IGNOU Assignment available at our website. IGNOU University always being in picture due to its IGNOU Assignment Date Extended. In this post Student will Get MEV 012 EARTH PROCESSES Solved Assignment 2021-22

Course Code : MEV-012

Course Title : Earth Processes

Assignment Code : MEV-012/TMA-01/January & July session 2021

Note: This assignment is based on the entire course. Answer any five questions. All question carries equal marks. Please write all answers in your own words.

For PDF and Handwritten WhatsApp 8130208920

1. Describe weathering and its types with suitable examples.

Rocks, minerals, soils normally change their structure under the action or influence of certain environmental forces. Biological activity, extreme weather, and agents of erosion such as water, wind and ice are examples of environmental forces that influences the continuous breakdown, wearing away and loosening of rocks and soils. This is what is termed as weathering.

Weathering is thus the process where rocks or soils are dissolved or worn away into smaller and smaller pieces due to particular environmental factors such as the examples given above. In geological terms, weathering is defined as the disintegration of rocks influenced by animal and plant life, water, and the atmospheric forces in general.

Weathering is different from erosion. While erosion is the process by which soil and rock particles are worn away and moved elsewhere by wind, water or ice, weathering involves no moving agent of transport. It is the process of breakdown of rocks at the Earth’s surface, either by extreme temperatures or rainwater or biological activity. It simply does not involve any movement of rock material.

“Weathering is the breaking down of rocks, soil and minerals as well as wood and artificial materials through contact with the Earth’s atmosphere, biota and waters. Weathering occurs in situ, roughly translated to: “with no movement”, and thus should not be confused with erosion, which involves the movement of rocks and minerals by agents such as water, ice, snow, wind, waves and gravity and then being transported and deposited in other locations.”

For PDF and Handwritten WhatsApp 8130208920

Mechanical or Physical Weathering

Mechanical weathering is also known as physical weathering. Mechanical weathering is the physical breakdown of rocks into smaller and smaller pieces. One of the most common mechanical actions is frost shattering. It happens when water enters the pores and cracks of rocks, then freezes. Frost weathering, frost wedging, ice wedging or cryofracturing is the collective name for several processes where ice is present. These processes include frost shattering, frost-wedging and freeze-thaw weathering.

Organic or Biological Weathering

Organic or biological weathering refers to the same thing. It is the disintegration of rocks as a result of the action by living organisms. Trees and other plants can wear away rocks since as they penetrate into the soil and as their roots get bigger, they exert pressure on rocks and makes the cracks wider and deeper. Eventually, the plants break the rocks apart. Some plants also grow within the fissures in the rocks which lead to widening of the fissures and then eventual disintegration.

Microscopic organisms like algae, moss, lichens and bacteria can grow on the surface of the rocks and produce chemicals that have the potential of breaking down the outer layer of the rock. They eat away the surface of the rocks. These microscopic organisms also bring about moist chemical micro-environments which encourage the chemical and physical breakdown of the rock surfaces. The amount of biological activity depends upon how much life is in that area. Burrowing animals such as moles, squirrels and rabbits can speed up the development of fissures.

Chemical Weathering

Chemical weathering happens when rocks are worn away by chemical changes. The natural chemical reactions within the rocks change the composition of the rocks over time. Because the chemical processes are gradual and ongoing, the mineralogy of rocks changes over time thus making them wear away, dissolve, and disintegrate.

The chemical transformations occur when water and oxygen interacts with minerals within the rocks to create different chemical reactions and compounds through processes such as hydrolysis and oxidation. As a result, in the process of new material formations, pores and fissures are created in the rocks thus enhancing the disintegration forces.

2. Explain the distribution of water in the earth’s crust and the hydrological cycle.

3. Write short notes on the following.

(a) Formation of continents and ocean basins.

(b) Sedimentary rocks.

4. Explain the terms hazard and disaster. Describe the types of hazards with examples.

5. Describe the various types man-made hazards and their impacts on humans.

6. Write short notes on the following.

(a) Earthquakes

(b) Earth’s radiation balance

7. Give a detailed account on the physical, chemical and biological aspects of sea water.

For PDF and Handwritten WhatsApp 8130208920

IGNOU MSCENV Solved Assignment

IGNOU MSCENV Solved Assignment: MEV 012 Solved Assignment 2021-22: Those students who had successfully submitted their Assignments to their allocated study centres can now check their Assignment Status. Alongside assignment status, they will also checkout their assignment marks & result. IGNOU MSCENV Solved Assignment 2021-22: All this is often available in a web mode. After submitting the assignment, you'll check you IGNOU Assignment Status only after 3-4 weeks. it'd take 40 days to declare.

For PDF and Handwritten WhatsApp 8130208920

Once the TEE assignments are submitted to the Centres, it's send to the evaluation department. MEV 012 Solved Assignment 2021-22: After which the evaluation of IGNOU Assignment Solutions takes place.