MANNAM FOUNDATIONCENTRE FOR EDUCATION TECHNOLOGY

(Recognized by NCTE and affiliated to the University of Kerala)PORUVAZHY, EDAKKAD P.O, KOLLAM

POWER POINT PRESENTATION

SEMESTER –II

B.Ed. COURSE 2014-15

NAME OF THE STUDENT TEACHER : AISWARYA RAJ. LSUBJECT : SOCIAL SCIENCECANDIDATE CODE : 16914373001 

Certified Record of ………………………..................................................……………

Candidate Code: ………....................……..............…….........…….. for the year 2014-15

ExaminerLecturer Principal

PRESENTED BY,

AISWARYA RAJ LSOCIAL SCIENCE

REG NO : 16914373001

MANNAM FOUNDATION CENTRE FOR EDUCATIONAL

TECHNOLOGY.PORUVAZHY, EDAKKAD

P.O., KOLLAM.

Composition ( what it is made of)

Crust Mantle Core

The Earth is divided into three layers based upon the material it contains.

The Crust The comparatively thin outer shell of the Earth. Approximately 40 km thick. Two parts- continental crust, oceanic crust. As silica and alumina are the chief contents, the continental crust is also known

as SIAL. As silica and magnesium are the chief

contents, the oceanic crust is also known as SIMA

Oceanic and continental crust

Oceanic crust is thin but very dense.

The Mantle Located beneath the crust. Extends up 2900 km from the the crust. Tow parts- upper mantle, lower mantle. The upper mantle, made up silicon compounds, is in a solid state. The lower mantle, located beneath the

upper mantle, is in a semi-liquid state.

The Core Central part of the Earth. From 2900 km to 6371km. Two parts- outer core, inner core Due to the high pressure prevailing at the centre, the inner core is in a solid state. The materials in the outer core are in a

molten state. It is mainly made up of the minerals nickel

(Ni) and iron (Fe), it is also known as NIFE.

A new way to divide the Earth

The Earth is also divided up into layers based upon the physical properties of each layer. Lithosphere Asthenosphere Mesosphere Outer core Inner core

Physical structure of the Earth ( 5 Layers )

Lithosphere :- Rigid outer layer ( crust and part of the mantle). Asthenosphere :- Soil rock that flows slowly, found below lithosphere like frosting part of the mantle . Mesosphere :- Middle layer, part of the mantle very rigid magma. Outer core :- Liquid layer. Inner core :- Solid, very dense.

Tectonic plates

Earth’s crust is broken into about 19 pieces. The plates move on top of the

asthenosphere.