Difference between revisions of "AY Honors/Waterfalls/Answer Key"
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| − | [[eo:Akvofalo]][[ | + | [[da:Vandfald]] [[de:Wasserfall]] [[eo:Akvofalo]] [[nl:Waterval]] |
| − | A '''waterfall''' is a geological formation resulting from a [[stream]] flowing over an [[erosion]]-resistant rock formation that forms a sudden break in elevation. | + | |
| + | <div style="float:right;margin-left:0.5em;text-align:center; width:300px"> | ||
| + | [[image:Base of Tower Fall with rainbow-300px.JPG]]<br> | ||
| + | <small>''Tower Fall in [[Yellowstone National Park]]''<br> | ||
| + | [[media:Base of Tower Fall with rainbow-750px.JPG|larger version]]</small></div> | ||
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| + | A '''waterfall''' is usually a geological formation resulting from a [[stream]] flowing over an [[erosion]]-resistant rock formation that forms a sudden break in elevation. Waterfalls may also be artificial, and they are sometimes used for [[garden]] and [[landscape]] ornament. | ||
Some waterfalls form in montane environments where erosion is rapid and stream courses may be subject to sudden and catastrophic change. In such cases, the waterfall may not be the end product of many years of water action over a region, but rather the result of relatively sudden geological processes such as [[thrust fault]]s or [[volcano|volcanic action]]. | Some waterfalls form in montane environments where erosion is rapid and stream courses may be subject to sudden and catastrophic change. In such cases, the waterfall may not be the end product of many years of water action over a region, but rather the result of relatively sudden geological processes such as [[thrust fault]]s or [[volcano|volcanic action]]. | ||
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Waterfalls are a hindrance to river transportation. The [[Welland Canal]] was built in [[1829]] to allow ships to pass Niagara Falls in the Great Lakes. | Waterfalls are a hindrance to river transportation. The [[Welland Canal]] was built in [[1829]] to allow ships to pass Niagara Falls in the Great Lakes. | ||
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| + | [[Image:Waterfall_formation.png]] | ||
Notable waterfalls include: | Notable waterfalls include: | ||
| − | * [[Angel Falls]], the world's highest at | + | * [[Angel Falls]], the world's highest at 979 m (3230 feet), in [[Venezuela]] in [[South America]] |
* [[Victoria Falls]], the world's largest, in [[Africa]], on the [[Zambezi River]] on the border between [[Zambia]] and [[Zimbabwe]] | * [[Victoria Falls]], the world's largest, in [[Africa]], on the [[Zambezi River]] on the border between [[Zambia]] and [[Zimbabwe]] | ||
*[[Boyoma Falls]], the world's highest volume, 17,000,000 liters per second (600,000 cubic feet per second), [[Congo River]], [[Democratic Republic of the Congo|Congo]] | *[[Boyoma Falls]], the world's highest volume, 17,000,000 liters per second (600,000 cubic feet per second), [[Congo River]], [[Democratic Republic of the Congo|Congo]] | ||
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* [[Niagara Falls]], the best-known in [[North America]], located on the [[Niagara River]] on the border between [[New York]], [[United States]], and [[Ontario]], [[Canada]] | * [[Niagara Falls]], the best-known in [[North America]], located on the [[Niagara River]] on the border between [[New York]], [[United States]], and [[Ontario]], [[Canada]] | ||
* [[Iguaçú Falls]], in [[South America]], on the [[Iguaçu River]] on the border between [[Brazil]] and [[Argentina]] | * [[Iguaçú Falls]], in [[South America]], on the [[Iguaçu River]] on the border between [[Brazil]] and [[Argentina]] | ||
| − | * [[Cumberland Falls]], | + | * [[Cumberland Falls]], a [[North America]]n waterfall advertised to have a "moonbow"; located in southeast [[Kentucky]] |
* [[Rhine Falls]], [[Europe]]'s largest, located in [[Switzerland]] | * [[Rhine Falls]], [[Europe]]'s largest, located in [[Switzerland]] | ||
* [[Reichenbach Falls]], [[Switzerland]], total drop 250 m (656 feet), at 90 m (300 feet) the Upper Reichenbach Falls is one of the highest cataracts in the [[Alps]]. Scene of the final fictional meeting between [[Sherlock Holmes]] and Professor Moriarty. | * [[Reichenbach Falls]], [[Switzerland]], total drop 250 m (656 feet), at 90 m (300 feet) the Upper Reichenbach Falls is one of the highest cataracts in the [[Alps]]. Scene of the final fictional meeting between [[Sherlock Holmes]] and Professor Moriarty. | ||
Revision as of 01:50, 2 February 2004
da:Vandfald de:Wasserfall eo:Akvofalo nl:Waterval
File:Base of Tower Fall with rainbow-300px.JPG
Tower Fall in Yellowstone National Park
A waterfall is usually a geological formation resulting from a stream flowing over an erosion-resistant rock formation that forms a sudden break in elevation. Waterfalls may also be artificial, and they are sometimes used for garden and landscape ornament.
Some waterfalls form in montane environments where erosion is rapid and stream courses may be subject to sudden and catastrophic change. In such cases, the waterfall may not be the end product of many years of water action over a region, but rather the result of relatively sudden geological processes such as thrust faults or volcanic action.
Most waterfalls are the result of many years' of action of water on the underlying strata. Typically, a stream will flow across an area of formations, and more resistant rock strata will form shelves across the streamway, elevated above the further stream bed when the less erosion-resistant rock around it disappears. Over a period of years, the edges of this shelf will gradually break away and the waterfall will steadily move upstream. Often, the rock strata just below the more resistant shelf will be of a softer type, and will erode out to form a shallow cave-like formation known as a rock shelter (also known as a rock house) under and behind the waterfall.
Streams often become wider and more shallow just above waterfalls due to flowing over the rock shelf, and there is usually a deep pool just below the waterfall due to the kinetic energy of the water hitting the bottom.
Waterfalls are a hindrance to river transportation. The Welland Canal was built in 1829 to allow ships to pass Niagara Falls in the Great Lakes.
Notable waterfalls include:
- Angel Falls, the world's highest at 979 m (3230 feet), in Venezuela in South America
- Victoria Falls, the world's largest, in Africa, on the Zambezi River on the border between Zambia and Zimbabwe
- Boyoma Falls, the world's highest volume, 17,000,000 liters per second (600,000 cubic feet per second), Congo River, Congo
- Yosemite Falls, the tallest in North America in Yosemite National Park in California, United States.
- Niagara Falls, the best-known in North America, located on the Niagara River on the border between New York, United States, and Ontario, Canada
- Iguaçú Falls, in South America, on the Iguaçu River on the border between Brazil and Argentina
- Cumberland Falls, a North American waterfall advertised to have a "moonbow"; located in southeast Kentucky
- Rhine Falls, Europe's largest, located in Switzerland
- Reichenbach Falls, Switzerland, total drop 250 m (656 feet), at 90 m (300 feet) the Upper Reichenbach Falls is one of the highest cataracts in the Alps. Scene of the final fictional meeting between Sherlock Holmes and Professor Moriarty.
- The Falls of Saint Anthony, the highest on the Mississippi.
See also: List of waterfalls
