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Download 7th Class Geography Notes (Unit-1) for Islamabad Model Schools & Colleges

Download 7th Class Geography Notes (Unit-1) for Islamabad Model Schools & Colleges

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Download 7th Class Geography Notes (Unit-1) for Islamabad Model Schools & Colleges

SHORT QUESTIONS

Briefly describe the characteristics of mantle.
·        Mantle is the layer 2900 kilometers below the crust.
·        It is composed of mineral olivine.
·        Its upper part combines with the crust to form Lithosphere.
What is a plate fault?
A plate fault is a fracture, or discontinuity in the Lithosphere. Large faults move the tectonic plates.
Where is the Ring of Fire located?
Ring of fire is located in the surroundings of the pacific ocean. It is called so due to most important sites of earthquakes.
In which sea or ocean most Tsunamis arise?
Most of the tsunamis arise in pacific ocean.

LONG QUESTION

Give a description of the interior of the Earth.
Interior of the earth is divided into three layers:
The Crust:
·        It is outermost layers and not uniform.
·        The part of crust under the oceans is known as oceanic crust.
·        Crust under the continents is  known as continental crust
The Mantle:
·        It is 2900 kilometers below the crust.
·        It is composed of mineral olivine.
·        Its upper part combines with the crust to form Lithosphere.
The Core:
·        It is inner most and the hottest part of the Earth.
·        Its thickness is about 3490 kilometers.
·        It is composed of nickel and iron.
What is Plate Tectonics? What causes the Plates to move?
·        Plate Tectonics is the theory that describes the movements of Tectonic plates.
·        The plates move on the top of the Asthenosphere.
·        Hot materials from the depths of the Asthenosphere keep on rising in the form of convection currents.
·        These convection currents cause to move the Tectonic plates in different directions.
What is a Volcano? What are different types of volcanic materials?
·        A volcano is a vent or chimney which transfers molten rock known as magma from depth to the Earth's surface.
·        There are two types of volcanic materials.
·        Solids: These consist of rock fragments that erupt with violent explosions.
These are in the form of rock pieces, dust or ash.

·        Lava flows: These consist of streams of molten rock that erupts without
explosion. Molten burning lava flows like small streams.

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Download Class Notes: Download 7th Class Geography Notes (Unit-1) for Islamabad Model Schools & Colleges
Download 7th Class Geography Notes (Unit-1) for Islamabad Model Schools & Colleges
Download 7th Class Geography Notes (Unit-1) for Islamabad Model Schools & Colleges
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