Which of the following did not contribute to the decline of the indus valley civilization (multiple choice) a. diseases reduced the population b. the surrounding land was severely deforested c. centuries of floods made the soil salty and unfit for farming d. volcanic eruptions covered the land with molten lava.

ANSWER:

"Volcanic eruptions covered the land with molten lava" did not contribute to the decline of the 'Indus valley civilization'.

EXPLANATION:

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.

answer (a) more rain in u s and less rain in australia and asia