41.   The result was much like a flapper valve that becomes encrusted with mineral deposits.

42.   There are products to use to remove mineral deposits.

43.   This system should be cleaned regularly to prevent mineral deposits and bacterial growths.

44.   To most developing nations, the economic promise of forests, mineral deposits or oil and gas outweighs environmental concerns.

45.   Water systems often accumulate sludge in the form of mineral deposits and rust.

46.   With potentially vast gas and oil reserves, lush forests and farmland and rich mineral deposits, Burma is a treasure trove of largely untapped resources.

47.   Zimbabwe was one of the richest nations in Africa, a cradle of fertile land and mineral deposits.

48.   Bunia is the headquarters of a Congolese rebel faction backed by Uganda and is also the gateway to important mineral deposits and stands of tropical hardwood timber.

49.   But the surrounding waters are rich in marine life and the seabed is thought to contain vast mineral deposits.

50.   CAMBRIDGE, England -- For three months, Terry Manning painstakingly removed layer upon layer of mineral deposits from a fossilized dinosaur egg.