algae control
51Plant — For other uses, see Plant (disambiguation). Plants Temporal range: Early Cambrian to recent, but see text, 520–0 Ma …
52Mollusca — Temporal range: Cambrian–Recent …
53Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… …
54Concerns and controversies over the 2008 Summer Olympics — 2008 Summer Olympics Bid process Venues Marketing Concerns and controversies Torch relay (route) Opening ceremony (flag bearers) Medal table (medalists) Closing ceremony Event calendar …
55arctic — arctically, adv. /ahrk tik/ or, esp. for 7, /ahr tik/, adj. 1. (often cap.) of, pertaining to, or located at or near the North Pole: the arctic region. 2. coming from the North Pole or the arctic region: an arctic wind. 3. characteristic of the… …
56climate — /kluy mit/, n. 1. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. 2. a region or… …
57pollution — /peuh looh sheuhn/, n. 1. the act of polluting or the state of being polluted. 2. the introduction of harmful substances or products into the environment: air pollution. [1350 1400; ME pollucioun ( < OF) < LL pollution , s. of pollutio… …
58Culture of microalgae in hatcheries — Raceway pond used to cultivate microalgae. The water is kept in constantly motion with a powered paddle wheel. Microalgae or microscopic algae grow in either marine or freshwater systems. They are primary producers in the oceans that convert… …
59protist — protistan /proh tis teuhn/, adj., n. protistic, adj. /proh tist/, n. any of various one celled organisms, classified in the kingdom Protista, that are either free living or aggregated into simple colonies and that have diverse reproductive and… …
60Airline — For other uses, see Airline (disambiguation). Airline A Boeing 767 300ER of Delta Air Lines, one of the world s largest passenger airlines …
