White House. Washington, D.C. White House, formerly known as the Executive Mansion (1810â1902), the official office and residence of the president of the United States at 1600 Pennsylvania Avenue N.W. in Washington, D.C. The White House and its landscaped grounds occupy 18 acres (7.2 hectares).
Quick Answer. Ecological balance is a theory stipulating that natural conditions, including numbers of various animal and plant species, remain stable on their own through variations over time.
The FAO/UNESCO Water Balance of Africa is an effort undertaken jointly by the Center for Research in Water Resources (CRWR) of the University of Texas at Austin, the United Nations Food and Agriculture Organization (FAO), and UNESCO, for the purpose of better assessment and planning of the water resources of Africa.