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8th Std., , Social Science - Geography, , 2. Lithosphere, , IL. Fill in the Blanks:, 1.The continental crust is also called sial., 2. A large basin shaped crater mouth is caldera., 3. The most destructive earthquake waves are Surface waves., , 4. Stalactities and Stalagmitesate the laid forms produced by Australia., 5. The Beaches are formed by the work ofsea wavework, , II Answer the following questions., 1. Mention the three major layers of the interior of the Earth., The three major layers of the interior of the Earth are Crust, Mantle, and, , Core., , 2. Name the types of volcanoes on the basis of the frequency of eruption., On the basis of the frequency of eruption, volcanoes are classified into, three types. They are, , Active volcanoes ii) Dormant volcanoes and, ii) Extinct volcanoes, , i), , 3.Mention the important earthquake zones ofthe world., *The Circum-Pacific Belt-Regions around the Pacific ocean, * The Mediterranean Belt-Regions around the Mediterranean sea., , The Himalayan belt-The Siwalik region ofIndia., 4. What is weathering? Name the three main types of weathering., , Weathering is the wearing away or breaking down or gradual disintegration, of rocks by agents present in the atmosphere. The three types of weathering, are, 1. Mechanical weathering, 3. Biological weathering., III. Match the, A, 1. SIMA, 2. Sandstone, 3. Epicenter, 4. Geyser, 5. Loess, , 2. Chemical weathering, , following, B, (c) Oceanic crust, (d) Sedimentary rock, , (a) Earthquake, (e) Underground watet, (b) Yellow soil