What is the importance of rivers and lakes?

What two major bodies of water were connected by the Panama Canal? Is the word tour abstract? Who designed the Hagia Sophia? What gas covered the earth? What is the capital of ahmedabad? Is the Hoover Dam part of the Grand Canyon? What two states does the Columbia River separate? How deep is the St Johns River? Is the Empire State Building a national monument? How long would it take to hit the ground if you jumped from the Eiffel Tower? What are the huge trees in golden gate park? Rain forests should be cut down? What connects Lake Michigan to the largest river in the united states.what river is that? The Sahara has about 90 large oases what is an oasis? How successful were stone keeps in defending those inside? Are castor beans in the Amazon Rainforest plentiful? When was State Heraldic Museum created? Is the Great Pyramid still in existence today? What are the Islands near Corsica? What does a river smell like?