According to the second paragraph, the formation of the Atlantic Ocean is the example of________.

A．a newspaper advertisement
B．a chapter of a novel
C．an excerpt from a textbook
D．a scientific report of new findings

A．the oceanic crusts and continental crusts
B．the crusts and the mantle
C．the crusts and the top and solid part of the mantle
D．the continental crests and the solid part of the mantle