Select the correct answer from each drop-down menu. Complete the following paragraph about changes to the American landscape that occurred during the 1870s.
After the passage of the Homestead Act, settlers flooded to the
where lumber was scarce. Barbed wire
enabled these settlers to fence in their lands. As a result, the movements of Native Americans and
were
severely restricted, and the era of
came to an end.
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C

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves