What are two reasons we know very little about the indus valley civilization

one reason is because they were a lost civilization for many years and a second reason they have mountains around them so it was very to get there.

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explanation:

  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d