Describe the typical formation and characteristics of a continental shield
What will be an ideal response?
The nucleus of a continent is called a craton and consists of ancient crystalline rock from which the continent grows. A continental shield is a large region where a craton is exposed at the surface. The formation of continental crust take hundreds of millions of years. It involves a sequence of seafloor spreading, leading to the formation of oceanic crust, subduction of this crust, and the remelting of it as new magma. Figure 13.5 illustrates the process.
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Transhumance is least common in
A) Thailand. B) Central Asia. C) parts of North Africa. D) Southern Africa. E) the Middle East.
Which environment would be likely to produce a black shale?
A) Shallow marine bay B) Swamp C) Forest D) Eolian dunes
Pure ice is a mineral while pure liquid water is not. Why?
A. Liquid water does not have a definite chemical composition. B. Liquid water does not have an orderly internal arrangement of atoms. C. Liquid water does not occur naturally. D. All of the choices are correct.
Late Cretaceous to early Paleogene coal deposits have higher sulfur content than the
Pennsylvanian age deposits found in the eastern United States. Indicate whether the statement is true or false.