Engelsk
Oversættelse fra engelsk til dansk?
08. januar 2006 af
Alexander Stephanou (Slettet)
Hej folkens. For et stykke tid siden postede jeg et lignende indlæg, men jeg fandt aldrig ud af, om der var svaret (og jeg kan af uforklarlige årsager ikke finde indlægget nu.) Mit spørgsmål går på, om der er en, der har mod på at oversætte nedenstående (eller noget af det? (så langt, man nu vil.)
Salts dissolved in seawater come from three main sources:
volcanic eruptions
chemical reactions between seawater and hot, newly formed volcanic rocks of spreading zones ( mid-oceanic ridges )
chemical weathering of rocks on the continents
Volcanic eruptions produce large volumes of gases that eventually reach the oceans -- most important are sulphate and chloride. Submarine eruptions at spreading ridges inject gases directly into the oceans; gases from sub-aerial volcanoes are dissolved in rainfall.
Chemical reactions between hot seawater and recently formed basaltic ocean crust lead to removal of magnesium and some sulphate from the seawater, while other elements like lithium and rubidium are added. Ocean water is circulated through the ocean crust by this exchange mechanism. The entire volume of all the ocean’s water circulates every 5-10 million years. This is probably the main reason that the composition of seawater has been nearly constant over billions of years.
Many salts in seawater originate from weathering of rocks on land. As rocks are weathered to form soils, they release soluble constituents like silica and elements like sodium, calcium, potassium and magnesium. River waters also carry bicarbonate (HCO3-) - a by-product of weathering of silicate rocks or dissolution of limestone. Once they enter the oceans the dissolved salts remain, while the water continues to move through the hydrological cycle.
Most reactions occur between soil waters and silicate ( feldspars, quartz, etc. ) or carbonate ( e.g. calcite, dolomite ) minerals in rocks:
Og evt.
Because, there is geological evidence to suggest that seawater has retained the same salinity for billions of years ( at least 3.4 Ga ) other processes must be removing dissolved constituents from seawater. Some are removed by chemical reactions between seawater and the sediment ( e.g. manganese nodules. ) Others ( e.g. silica, nitrate, calcium carbonate ) are removed by organisms, including skeletal material. Other constituents, like sodium and chloride are removed as salts ( evaporite deposits ) when some of the seawater evaporates. This occurs when an arm of the sea is partially or totally cut-off from the open ocean and happens to lie in an arid climatic zone. The potash deposits of Saskatchewan were formed when an arm of the sea was isolated from the open ocean about 400 million years ago. Most of the water evaporated, leaving behind a thick deposit of salts. Wind blowing sea-spray also removes salt as aerosols which may be deposited along the coastline. Also, some minerals in seafloor sediments, such as clays, adsorb ( “grab” ) metallic ions from seawater onto their surfaces. When evaporites and seafloor sediments are uplifted, associated with collision of lithospheric plates, they again become subject to weathering and the dissolved salts eventually return to the sea.
Jeg må indrømme, at det engelske sprog i ovenstående er lidt for svært til at vide sig sikker på betydningen. Derfor spørger jeg - på forhånd tak!
Salts dissolved in seawater come from three main sources:
volcanic eruptions
chemical reactions between seawater and hot, newly formed volcanic rocks of spreading zones ( mid-oceanic ridges )
chemical weathering of rocks on the continents
Volcanic eruptions produce large volumes of gases that eventually reach the oceans -- most important are sulphate and chloride. Submarine eruptions at spreading ridges inject gases directly into the oceans; gases from sub-aerial volcanoes are dissolved in rainfall.
Chemical reactions between hot seawater and recently formed basaltic ocean crust lead to removal of magnesium and some sulphate from the seawater, while other elements like lithium and rubidium are added. Ocean water is circulated through the ocean crust by this exchange mechanism. The entire volume of all the ocean’s water circulates every 5-10 million years. This is probably the main reason that the composition of seawater has been nearly constant over billions of years.
Many salts in seawater originate from weathering of rocks on land. As rocks are weathered to form soils, they release soluble constituents like silica and elements like sodium, calcium, potassium and magnesium. River waters also carry bicarbonate (HCO3-) - a by-product of weathering of silicate rocks or dissolution of limestone. Once they enter the oceans the dissolved salts remain, while the water continues to move through the hydrological cycle.
Most reactions occur between soil waters and silicate ( feldspars, quartz, etc. ) or carbonate ( e.g. calcite, dolomite ) minerals in rocks:
Og evt.
Because, there is geological evidence to suggest that seawater has retained the same salinity for billions of years ( at least 3.4 Ga ) other processes must be removing dissolved constituents from seawater. Some are removed by chemical reactions between seawater and the sediment ( e.g. manganese nodules. ) Others ( e.g. silica, nitrate, calcium carbonate ) are removed by organisms, including skeletal material. Other constituents, like sodium and chloride are removed as salts ( evaporite deposits ) when some of the seawater evaporates. This occurs when an arm of the sea is partially or totally cut-off from the open ocean and happens to lie in an arid climatic zone. The potash deposits of Saskatchewan were formed when an arm of the sea was isolated from the open ocean about 400 million years ago. Most of the water evaporated, leaving behind a thick deposit of salts. Wind blowing sea-spray also removes salt as aerosols which may be deposited along the coastline. Also, some minerals in seafloor sediments, such as clays, adsorb ( “grab” ) metallic ions from seawater onto their surfaces. When evaporites and seafloor sediments are uplifted, associated with collision of lithospheric plates, they again become subject to weathering and the dissolved salts eventually return to the sea.
Jeg må indrømme, at det engelske sprog i ovenstående er lidt for svært til at vide sig sikker på betydningen. Derfor spørger jeg - på forhånd tak!
Svar #1
08. januar 2006 af Alexander Stephanou (Slettet)
Hov, den øverste spalte ser ikke helt overskuelig ud:
Salts dissolved in seawater come from three main sources:
volcanic eruptions
chemical reactions between seawater and hot, newly formed volcanic rocks of spreading zones ( mid-oceanic ridges )
chemical weathering of rocks on the continents
Volcanic eruptions produce large volumes of gases that eventually reach the oceans -- most important are sulphate and chloride. Submarine eruptions at spreading ridges inject gases directly into the oceans; gases from sub-aerial volcanoes are dissolved in rainfall.
Salts dissolved in seawater come from three main sources:
volcanic eruptions
chemical reactions between seawater and hot, newly formed volcanic rocks of spreading zones ( mid-oceanic ridges )
chemical weathering of rocks on the continents
Volcanic eruptions produce large volumes of gases that eventually reach the oceans -- most important are sulphate and chloride. Submarine eruptions at spreading ridges inject gases directly into the oceans; gases from sub-aerial volcanoes are dissolved in rainfall.
Svar #2
09. januar 2006 af Alexander Stephanou (Slettet)
Er der ingen engelsk-faglige derude, der har lyst?
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