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Phasing a site represents reducing the site either in excavation or post-excavation to contemporaneous horizons whereas "digging in phase" is the process of stratigraphic removal of archaeological remains so as not to remove contexts that are earlier in time "lower in the sequence" before other contexts that have a latter physical stratigraphic ...
The project aims to launch 10 or more approximately 2 km-long (1.2 mi) systems which they predict could remove 50% of the debris in the Great Pacific Garbage Patch five years from deployment. [7] [8] The river system consists of a variety of floating barriers and extraction systems which are anchored within rivers or at rivermouths.
Ultrasonic algae control is a commercial technology that has been claimed to control the blooming of cyanobacteria, algae, and biofouling in lakes, and reservoirs, by using pulsed ultrasound. [ 6 ] [ 7 ] The duration of such treatment is supposed to take up to several months, depending on the water volume and algae species.
Barley straw, in England, is placed in mesh bags and floated in fish ponds or water gardens to help reduce algal growth without harming pond plants and animals. Barley straw has not been approved by the United States Environmental Protection Agency (EPA) for use as a pesticide and its effectiveness as an algaecide in ponds has produced mixed results during university testing in the United ...
In most ponds both bacteria and algae are needed in order to maximize the decomposition of organic matter and the removal of other pollutants. [15] Algae produce oxygen (photosynthesis) and also consume oxygen (respiration), but they leave an excess of oxygen that can then be used by aerobic bacteria for respiration and for the processes of ...
In northern Peru, the World Bank's business-lending arm is part owner of the Yanacocha gold mine, accused by impoverished farming communities of despoiling their land in pursuit of the precious ore. The bank and IFC have stepped up investments in projects deemed to have a high risk of serious and environment damage, including oil pipelines, mines and even coal-fired power plants, an ...
Sonar images interpreted as being symmetrical and geometric stone structures resembling an urban complex were first recorded in early 2001 covering an area of 2 square kilometres (200 ha) at depths of between 600 metres (2,000 ft) and 750 metres (2,460 ft).
Corallinales is the one genus of red algae exists but their distribution ranges across the world's oceans. [30] Examples include Corallina , Neogoniolithon , and Harveylithon. [ 30 ] The magnesium-rich calcium carbonate of Corallinales cell wall provides shelter from predators and structural integrity in the intertidal zone.