Wrap Up, Glossary

WRAP UP

• The Earth’s interior structure is compared with that of an apple

• The crust is the outer-most layer of the earth.

• The upper part of the earth crust is SIAL.

• The lower part of the earth crust is SIMA.

• The mantle is about 2900km thick.

• The lithosphere is broken into a number of plates known as the lithospheric plates

• The earthquake waves are recorded by aninstrument known as seismograph.

• Tsunami is caused by an underwater earthquake.

• A volcano is a vent or opening in the earth crust.

• The Shape of a volcano depends on the type of lava and force of the eruption.

• There are three major zone of volcanic activity in the world.

Glossary

1. Core: The inner most layer of the earth கரு

2. Mantle: The second layer beneath the crust கவசம்

3. Mohorovicic discontinuity: Boundary that separated the mantle from the crust மோஹோரோவிசிக் எல்லை

4. Land slide: Downward movements of rock debris of the mountain நிலச்சரிவு

5. Seismograph: Instrument to measures the magnitude of an earthquake சீஸ்மோகிராப்

6. Tsunami: Sea waves caused by an underwater earthquake or a volcanic eruption under sea. ஆழிப்பேரலை

7. Vent: An opening a the earth surface from which volcanic material is emitted எரிமலைத் துளை

8. Magma: The molten state of rocks பாறைக்குழம்பு

9. Lava: The solidified form of magma after it reaches the surface of the earth எரிமலைக்குழம்பு

10. Viscosity: A liquids resistance to flow பாகுத்தன்மை

Reference

Majid Husain, Physical Geography Anmol Publication Pvt Ltd

A Das Gupta, A.N. Kapoor, Principles of Physical Geography, S. Chand & Company Ltd., New Delhi

Goh Cheng Leong, certificate Physical and Human Geography, Oxford University press.Savindra Singh (2015) physical Geography Pravalika publications Allahabad.

ICT CORNER

Interior of the Earth

select full screen mode and play the game with descriptions

PROCEDURE

Step 1: Open the Browser and type the URL given below (or) Scan the QR Code.

Step 2: Click on the Map to start

Step 3:  select full screen mode and play the game with descriptions

Interior of the Earth URL:

http://world-geography-games.com/earth/index.html

*Pictures are indicative only

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