10. A river valley that was carved out by a glacier and is now an estuary is cal

Question

10. A river valley that was carved out by a glacier and is now an estuary is called a A. fjord B. jetty C. delta D. distributary E. tributary 11. Drowned river valley estuaries were formed when A. the weight of ice-age glaciers depressed the margins of the continents B. tectonic changes resulted in increased tidal range C. sea level rose as a result of melting glaciers D. erosion during flooding removed the substrate from the river mouth 12. The surface water in a salt-wedge estuary is A. saltier than the bottom water B. derived primarily from the ocean C. anoxic D. fresher (less saline) than the bottom water 13. Circulation in fjords can be sluggish and bottom waters anoxic due to restricted flow caused by A. groins B. jetties C. sills formed from glacial morains D. barrier islands E. spits ed fro

Explanation / Answer

1)A river valley that was carved out by a glacierand is now an estuary is Fjord. It is formed by glaciers because of several ice ages it shaped the landscape it is also marked bt dramatic mountain scenery.

2)Drowned river valley are formed when when there is melting of glaciers. Sea level rose because of it which enter into low land area. It is also called coastal plain estuaries and is a bar-built estuaries and form parallel to coastline which separate estuary from the ocean.

3)The surface water is a salt wedge estuary is fresher than the bottom water as it creates a wedge on the surface leading to a freshwater line above the salt water.Reasons for change in salinity are evaporation,adding of river water in the sea.

4)Sills formed from the glacial morains cause circulation in fjords to be sluggish and bottom waters anoxic. It is an principal zone of deposition and example of it are igneous instrusions.

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