In what year was the U. S. rural population at about 25 million? a. 1900
C. 1840
b. 1860
d. 1880

Ateam of scientists studied the sediment at the bottom of an ancient lake. they were able to determine the weather conditions of the indus valley in ancient times. they found that the entire area had suffered a drought after the monsoons declined. this drought lasted 200 years. because of the drought, there wasn’t enough food or water. the people of the indus valley were forced to leave their cities.

Match each model with its name and the name of the scientist who created it.

The eastern roman empire is also known as what empire