Sentences with phrase «when land erosion»
By Rina Saeed Khan KETI BUNDER, Pakistan (Thomson Reuters Foundation)- For fisherman Sammar Dablo, it was as if «the seawater stole our homes» when land erosion forced his village to relocate further inland on Pakistan's south coast.
https://www.scientificamerican.com/ Not exact matches
In the 1950s, when the Soil Conservation Service (now known as the Natural Resources Conservation Service) began defining tolerable rates of soil erosion from agricultural land, hardly any data on rates of soil production were available.
Those soft landings will be mixed with some hard landings as happened in the African country of Rwanda in 1994, when Rwandans transiently solved — if I can use that word — their own problems of over population and deforestation and soil erosion in a horrible way — namely in 1994 awhen six million Rwandans killed nearly one million Rwandans — mostly with machetes — and drove another two million into exile.
Eventually, however, terrestrial red and green algae and the first lichens developed on land and the final big rise in oxygen may have been caused by the «greening of the continents from around 800 million years ago,» when these simple early lifeforms on land steadily spread and broke down rocks that sustained a higher rate of erosion and led to the release of more nutrients into the oceans that stimulated even more photosynthesis by more newly evolved algae as well as older cyanobacteria (Nick Lane, New Scientist, February 10, 2010).
This chemical weathering process is too slow to damp out shorter - term fluctuations, and there are some complexities — glaciation can enhance the mechanical erosion that provides surface area for chemical weathering (some of which may be realized after a time delay — ie when the subsequent warming occurs — dramatically snow in a Snowball Earth scenario, where the frigid conditions essentially shut down all chemical weathering, allowing CO2 to build up to the point where it thaws the equatorial region, at which point runaway albedo feedback drives the Earth into a carbonic acid sauna, which ends via rapid carbonate rock formation), while lower sea level may increase the oxidation of organic C in sediments but also provide more land surface for erosion... etc..