B. The emergence of polished stone tools caused the emergence of agriculture
Georgia's largest employer is Emery University with 40,000 employees.
Disease devastated the population.
A series of wars forced people to leave the area.
Massive flooding disrupted farming.
Explanation:
- The Indus Valley civilization is one of the oldest civilizations, in addition to Sumerian and ancient Egypt. It originated about 5,000 years ago in the Indus Valley on the border between modern India and Pakistan, reaching its peak between 2200 BC and 1900 BC.After 1900 BC.
- its power began to decline, and after a few centuries it would completely disappear.
- The cities in the Indus Valley were deserted and their tribes moved to the villages at the foot of the Himalayas.
- Many historians and archaeologists have linked the disappearance of civilization to the climate change in the region, which has become colder as the monsoon weakens.
- The cause may be some invasion or change in the flow of the Indus River.
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Einstein’s gas absorption heat pump was helpful to people in many ways.
<u>Explanation:</u>
The gas absorption heat pump which was patented in the name of Albert Einstein in the 1930s as the Einstein Refrigerator. With this invention the problem of the potential energy crisis could be over come especially prevailing in the United Kingdom.
This refrigerator does not use any green house gas to function and can work without using electricity there fore saving the environment from a lot of harmful emissions. This also did not release any fumes which were poisonous and harmful to the lives of the humans.