act in which earth is worn away, often by water, wind, or ice. One possible origin for such plant remains would be, Salt marshes are expanses of vegetation, such as sea purslane, salt. addPrebidAdUnits(pbAdUnits); { bidder: 'appnexus', params: { placementId: '11653860' }}, An area of low-lying land that is usually saturated with water and is dominated by herbaceous rather than woody plants. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot_flex' }}, googletag.pubads().setTargeting("cdo_ptl", "entry-lcp"); A well-known example is the Pripet Marshes and fens that historically have served as the natural boundary between Poland and Russia. iasLog("criterion : cdo_t = earth-and-outer-space"); Is there much to lead them to build new houses, to establish new industries, drain more marshes?

Because the delta is deposited by sediment settling from the river water, the land that is built will be poorly drained at its driest and will often be underwater. { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, googletag.pubads().setTargeting("cdo_pt", "entry"); { bidder: 'openx', params: { unit: '539971066', delDomain: 'idm-d.openx.net' }}, ga('require', 'displayfeatures'); { bidder: 'appnexus', params: { placementId: '11653860' }}, { 'min': 0, initAdSlotRefresher(); © 1996 - 2020 National Geographic Society.

These values correspond to nearly 30 tons per acre per year and are equal to the highest values that have been achieved in agriculture. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_leftslot' }}]},

'increment': 1, params: { { bidder: 'appnexus', params: { placementId: '11654156' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776160', position: 'atf' }}, top layer of the Earth's surface where plants can grow. if(pl_p) "sign-in": "https://dictionary.cambridge.org/us/auth/signin?rid=READER_ID",

{code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, 'increment': 0.01, googletag.pubads().setTargeting("cdo_pc", "dictionary"); {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot_flex' }}, }); pbjs.que = pbjs.que || []; { bidder: 'appnexus', params: { placementId: '11654149' }},

ga('create', 'UA-31379-3',{cookieDomain:'dictionary.cambridge.org',siteSpeedSampleRate: 10}); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_HDX' }}, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot_flex' }}, The draining of the Mesopotamian Marshes occurred in Iraq and to a smaller degree in Iran between the 1950s and 1990s to clear large areas of the marshes in the Tigris-Euphrates river system.Formerly covering an area of around 20,000 km 2 (7,700 sq mi), the main sub-marshes, the Hawizeh, Central, and Hammar marshes and all three were drained at different times for different reasons. expires: 365

{ bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, iasLog("criterion : cdo_t = earth-and-outer-space"); {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250], [320, 50], [300, 50]] } }, They drained marshes, irrigated desert land, and developed the country, large parts of which had been allowed to go to waste. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_leftslot' }}, The Rights Holder for media is the person or group credited.

Text on this page is printable and can be used according to our Terms of Service. googletag.enableServices();

{ bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot2' }},

bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776140', position: 'atf' }}, name: "_pubcid", { bidder: 'appnexus', params: { placementId: '11654156' }}, { bidder: 'openx', params: { unit: '539971079', delDomain: 'idm-d.openx.net' }}, { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, googletag.pubads().enableSingleRequest();

These small marshes formed because the landscape left by the retreat of glacial ice was so irregular and so poorly drained that countless little depressions were filled with water each spring.

var pbDesktopSlots = [

iasLog("criterion : cdo_dc = english"); Even large raptors such as osprey are supported by tidal salt marshes.Commercially valuable fish and shellfish find food and shelter in salt marshes. {code: 'ad_rightslot', pubstack: { adUnitName: 'cdo_rightslot', adUnitPath: '/2863368/rightslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, dfpSlots['houseslot_b'] = googletag.defineSlot('/2863368/houseslot', [], 'ad_houseslot_b').defineSizeMapping(mapping_houseslot_b).setTargeting('sri', '0').setTargeting('vp', 'btm').setTargeting('hp', 'center').setTargeting('ad_group', Adomik.randomAdGroup()).addService(googletag.pubads());

Code of Ethics, A marsh is a wetland, an area of land where water covers ground for long periods of time, Biology, Earth Science, Geography, Physical Geography. googletag.pubads().disableInitialLoad(); } name: "unifiedId", species at the top of the food chain, with no predators of its own. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }},

{ bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot2_flex' }}, Marshy papyrus is one of the most important plants in the development of civilization: Papyrus growing in the marshy delta of the Nile River was dried, treated, and used as an early form of paper by ancient Egyptians. ga('send', 'pageview'); Add marsh to one of your lists below, or create a new one. marsh definition: The definition of a marsh is a swampy area of lowlands. { bidder: 'ix', params: { siteId: '195451', size: [300, 50] }}, Wildlife such as the Florida panther are endangered because of the reduction of habitat.The marshes of Doana National Park, in Andalusia, Spain, have been greatly affected by human activity along the Guadalquivir and Guadiamar Rivers. Temperature range, soil type, and the amount of light and water are unique to a particular place and form the niches for specific species allowing scientists to define the biome. Salt marshes are among the most productive natural systems. { bidder: 'ix', params: { siteId: '195465', size: [300, 250] }},