Author Question: Describe the typical formation and characteristics of a continental shield. What will be an ideal ... (Read 87 times)

anjilletteb · **on:** Jul 14, 2018

Describe the typical formation and characteristics of a continental shield.

What will be an ideal response?

Question 2

According to MacArthur and Wilson's theory of island biogeography, which of the following is correct?

A) The number of species decreases with island area.
B) The number of species increases with island area.
C) There is no relationship between species number and island area.

Ashley I · **Reply #1 on:** Jul 14, 2018

Answer to Question 1

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.

Answer to Question 2

B