Describe the internal structure and composition of the earthJan 2013 Dec 2013

The Eduladder is a community of students, teachers, and programmers just interested to make you pass any exams. So we solve previous year question papers for you.
See Our team
Wondering how we keep quality?
Got unsolved questions?

Ask Questions

VTU-SYLLABUS-2010-Civil-APPLIED-ENGINEERING-GEOLOGY-10CV36-Engineering-->View question

Describe the internal structure and composition of the earth.(Jan-2013) (Dec-2013)?

Describe the internal structure and composition of the earth.
(Jan-2013) (Dec-2013)

Asked by:Rajiv

Taged users:

Be first to like this question

Be first to dislike this question
Talk about this  Delete  Like  Dislike

It is the solid part of the earth and in a broader sense includes all the solid materials

composing the earth from surface downwards, although sometimes-specific terms are
used for deeper earth zones. Recent detailed seismic studies of the body of the earth have
shown that it is composed of three well-defined shells, Crust, Mantle, Core.

The Crust: - Is the topmost shell of the earth, which has a thickness of 30-40 km in the
continents and 5-6 km in the oceans. There is a striking variation in the materials or
rocks, as they are called, composing the crust over the continents and ocean floors. The
oceanic crust is made up of heavier and darker rocks called basalts compared to light-
colored and light-density, granitic rocks of the continental crust. When considered as a
part of the total structure of the earth, crust makes only an insignificant part represented
by a thin layer, similar to the skin of an apple. As regards he chemical composition of
the crust, analyses made by Clarke and Gold Schmith, using rocks from different
geographic regions of the crust have all shown that when expressed in terms of oxides,
the crust has Silica as the most dominant component, its value lying above 50% by
volume in the oceanic crust and above 62% in the continental crust. Alumina is the next
important oxide, varying between 13-16% followed by Iron Oxides (8%), Lime (6%),
Sodium (4%), Magnesium (4%), Potassium (2.5%) & Titanium (2%). The crust itself
shows a complicated structure both in make-up and compositional variations.
The Mantle: - At the base of the crust materials of the earth become greatly different in
many properties from those overlying them in the crust. These materials appear to form nearly homogeneous zone till a depth of 2900 km is reached. This zone of materials lying
between crust and a depth of 2900 km is known a MANTLE. It is made up of extremely
basic materials, called ultra basic rocks, which are believed to be very rich in iron and
magnesium but quite poor in silica. Such rock names as Periodotites, Dunite. This One
is characterized with a high density, increasing steadily with depth further; the mantle
material is believed to be highly plastic in nature. Many of the most important geological
process such as earthquakes and formation of mountains are believed to have their origin in this zone.

The Core: - It is the third and the innermost structure shell of the earth, which is clearly
marked by the seismic evidence. It starts at a depth of 2900 km below the surface and
extends right up to the center of the earth at 6370 km. The material making g the core is
found to be from seismic studies only strikingly different from that making the other two
shells in one major aspect, in elastic properties. The material has no shear resistance,
which makes it nearer to liquid than to a solid body. It has a very high density, above
10gms/cubic centimeter, at the mantle –core boundary. Nothing can be said about the
composition of the core. According to one, widely favored view, the core is made up of
Iron and Nickel.

Answerd By:neenu2

Be first to like this answer

Be first to dislike this answer
Talk about this  Delete  Like  Dislike

Can you help us to add better answer here? Please see this

You may also like our videos

Below are some of the videos from our collection. We saw that students not only needed content but also videos. So, we decided to build a video platform for you also an algorithm which shows best videos suites to you related to the content you are browsing check out some videos which suit best for you.

Lets together make the web is a better place

We made eduladder by keeping the ideology of building a supermarket of all the educational material available under one roof. We are doing it with the help of individual contributors like you, interns and employees. So the resources you are looking for can be easily available and accessible also with the freedom of remix reuse and reshare our content under the terms of creative commons license with attribution required close.

You can also contribute to our vision of "Helping student to pass any exams" with these.
Answer a question: You can answer the questions not yet answered in eduladder.How to answer a question
Career: Work or do your internship with us.Work with us
Create a video: You can teach anything and everything each video should be less than five minutes should cover the idea less than five min.How to upload a video on eduladder
Donate: Ad revenue alone is not able to take care of our server cost consider donating at least a dollar Click here to donate.

Not the answer you're looking for? Browse other questions from this Question paper or ask your own question.

Ask your question?