I would go with 'Major sandstorms destroyed the crops' because the Indus Valley civilization most likely declined by something affecting the food.
It believe it's the Pythagorean Theorem, named after Pythagoras in ancient Greece 2,500 years ago
Answer:
Under the geocentric model, the Sun, Moon, stars, and planets all orbited Earth. The geocentric model was the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle in Classical Greece and Ptolemy in Roman Egypt.
Explanation:
The Wagner act is also known as the National Labor Standards act
