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Q. No. 1: Encircle the correct option: /36 Oceans are of the total Earths mass:a. 1/1,000,000b. 2/10,000c. 1/1,000d. 2/1.000, 000 Seismic waves are of __ kinds.a. Two b. Three c. Four d. Five The mouth of the volcano is known as:a. Vent b. Cones c. Crater d. Caldera How many active volcanoes in the world?a.… Continue reading Previous paper class 7th(S.St)