The author says a caisson is kept free of water

because it is like

Per capita GDP is a better measure of a nation's economic development than total GDP because

How much of Haiti's forests have been cut down? a. 1% b. 25% c. 50% d. 98%

What were some of the effects of imperialism on china?

How long does a president have to sign a bill before it becomes law without his signature?

Having too much pride is a common theme in greek stories. For Achilles, his pride is his most glaring and majow flaw. It causes his downfall. Think about the events so far in the story. Why is Achilles' excessive pride causing his downfall?

What are the responsibilities of a lord in the Middle Ages

How were Booker T. Washington's and W. E. B. DuBois's views on race in America alike? Both sought a gradual reconciliation of the races. Both wanted improved opportunities for black Americans. Both advocated violence to achieve racial equality.

The first attempts to create a transcontinental railroad failed in part because the technology was not sufficient. Congress could not agree on where the line would run. The Civil War blocked construction.

What was the main goal of the 15th Amendment?

What is the meaning of the slogan in the beginning of the speech of the need for progress