3. Fig. 3 shows a major feature of Georgia called the Fall Line. It is called th

ID: 117121 • Letter: 3

Question

3. Fig. 3 shows a major feature of Georgia called the Fall Line. It is called this because most rivers have a steep drop when they cross this line as they flow towards the Atlantic or Gulf. Above the Fall Line, the terrain is hilly or mountainous, while below the Fall Line, it is much flatter.

A) Which geologic regions are above the Fall Line, and which are below?

B) What is the geologic region that dominates southern Georgia, and what is its major rock type? How does this type of rock form, and where did it come from? (hint: most of the major rivers in Georgia flow from the north to the south or southeast)

C) A major and economically important mineral in Georgia is kaolin. What is kaolin? How does it form? What regions in Georgia would you expect to find it?

D) Think about the rock types in the Piedmont and Coastal Plain regions. Which one do you think would be more resistant to weathering? How might this explain why the Fall Line has such a sudden change in elevation?

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Explanation / Answer

a) geologic regions are above the Fall Line:

geologic region below the Fall Line:

b) geologic region that dominates southern Georgia:

major rock type:

sedimentary rocks (late cretaceous to holocene).it is divided from the peidmont fall line passes through georgia. also some marine and terrestrial and rare fragnents of dinosaurs are deposited.the main mineral resource of coastal plain in georgia is kaolin.

this type of rock form by major fault system,metamorphisms,then weathering processes e.t.c.

it comes from the peidmont fall line passes through georgia from augusta in the east then southwestward to macon,then to columbus and finally westward alabama.

C) A major and economically important mineral in Georgia is kaolin.

kaolin is a fine, soft,white clay resulting from the natural decomposition of other clays or feldsper.

formation of kaolin:

about 100ma to 45 ma ago in sediment derived from weathred igneous and meta kaolin rocks.

kaolin production in US during 2011 was 5.5 million tonnes.

region:

kaolin found at the coastal plain in georgia which is a part of a geologic regionthat extends from the new jersey to texas.

D) the Piedmont would be more resistant to weathering than coastal plain regions.

because coastal plain regions mainly consist of sedimentary rock ,feldsper that are more prone to erosion.

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