The students will learn the three main theories why the Indus River Valley civilization declined through using the inquiry model. The three main reasons are: Invasion by the Aryans, effects of Plate Tectonics, and Natural Disasters, such as flooding, and monsoons. The lesson will begin with a demonstration the three main causes. The students will work in pairs and as a class to formulate hypotheses of why the Indus River Valley declined. Students will work similar to historians by reviewing secondary sources to support their hypotheses.

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