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.
Large dams have harmed Siberia's delicate ecological balance. â¦ ecologically adv. It is economical to run and ecologically sound. 2 adj Ecological groups, movements, and people are concerned with preserving the environment and natural resources, so that they can be used in a sensible way, rather than being wasted. ADJ n. Ecological groups say that nothing is being done to tackle the problem. Translation English Cobuild Collins Dictionary &nbsp. See also: ecologically, economical, ecologist, etymological. Add your entry in the Collaborative Dictionary.