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.
Examples of disturbances to ecological balance include bombing during the Vietnam War that destroyed habitat for many species. As part of modern global commerce as of 2014, trees and vegetation are sometimes removed, and those areas in which vegetation is removed and pavement is added tend to expand.