Lava with a higher content of has higher viscosity. If a large explosion causes the magma chamber below a volcano to empty, the volcano can collapse and form a/an .
Shield volcanoes can form when less lava flows quickly away from a vent.

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.

well its is frequent rain

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