Dune | Wikipedia audio article
Channel: wikipedia tts
Date: 04/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Dune


00:01:37 1 Formation
00:02:23 2 Aeolian dunes
00:02:33 2.1 Aeolian dune shapes
00:03:04 2.1.1 Barchan or crescentic
00:04:19 2.1.1.1 Transverse dunes
00:04:45 2.1.2 Seif or longitudinal dunes
00:06:49 2.1.3 Star
00:07:36 2.1.4 Dome
00:07:54 2.1.4.1 Lunettes
00:08:47 2.1.5 Parabolic
00:13:21 2.1.6 Reversing dunes
00:13:56 2.1.7 Draas
00:14:37 2.2 Dune complexity
00:15:42 2.3 Dune movement
00:16:26 2.4 Coastal dunes
00:20:17 2.4.1 Ecological succession on coastal dunes
00:22:43 2.5 Coastal dune floral adaptations
00:24:22 2.6 Nabkha dunes
00:24:45 3 Sub-aqueous dunes
00:26:09 4 Lithified dunes
00:27:06 5 Desertification
00:28:48 6 Conservation
00:29:46 7 Examples
00:29:55 7.1 Africa
00:32:23 7.2 Asia
00:33:27 7.3 Europe
00:35:05 7.4 North America
00:37:41 7.5 South America
00:38:37 7.6 Oceania
00:39:12 7.7 World's highest dunes
00:39:21 7.8 Sand dune systems
00:41:11 7.9 Extraterrestrial dunes
00:42:06 8 See also



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SUMMARY
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In physical geography, a dune is a hill of loose sand built by aeolian processes (wind) or the flow of water. Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have a shorter "slip face" in the lee side. The valley or trough between dunes is called a slack.  
An erg or sand sea is a large broad, flat area covered with wind-swept sand and/or dunes with little or no vegetation. Smaller areas are called dune fields.
Dunes occur in some deserts, inland and along some coasts. Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the beach. In most cases, the dunes are important in protecting the land against potential ravages by storm waves from the sea. Although the most widely distributed dunes are those associated with coastal regions, the largest complexes of dunes are found inland in dry regions and associated with ancient lake or sea beds. Dunes can form under the action of water flow (fluvial processes), and on sand or gravel beds of rivers, estuaries and the sea-bed.

The modern word "dune" came into English from French around 1790, which in turn came from Middle Dutch dūne.