marine mammal, Odobenus rosmarus, found in Arctic seas. Largest of the fin-footed mammals, or pinnipeds (see seal ), the walrus is also distinguished
Chemical compound of hydrogen and oxygen elements – H 2 O. It can exist as a solid (ice), liquid (water), or gas (water vapour). Water is the most
Any of a number of aquatic bugs where all stages of the life cycle (adult, larval, and egg) occur in the water; the eggs are usually attached to the
The water cycle, frequently referred to as the hydrologic cycle, is a continuous movement of water on, above, and below the surface of the earth. It
contamination of water resources by harmful wastes; see also sewerage , water supply , pollution , and environmentalism .
aquatic mammal of the order Cetacea, found in all oceans of the world. Members of this order vary greatly in size and include the largest animals that
the hunting of whales for the oil that can be rendered from their flesh, for meat, and for baleen (whalebone). Historically, whale oil was
( bӘlō'gӘ ) or white whale, small, toothed northern whale , Delphinapterus leucas. The beluga may reach a length of 19 ft (5.8 m) and a weight of