Answer:
Metals: These were important for the Harappans, because metals were used for making seals and ornaments.
The gold, silver, bronze, tin, lead and copper were the main metals.
Writing : They know the art of writing and their language was Written in picture like sign called pictograph.
Wheel: Wheel was used for making carts. It was also used for designing pottery.
Plough : Plough was used for digging the earth for turning the soil and planting seeds.
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