Shield areas in continental interiors are characterized by____________ .
A) linear chains of mountains less than 100 million years old
B) ancient coastal regions that have become abandoned and eroded
C) flat river valleys that cut through older mountain ranges
D) flat areas that include rocks older than 1 billion years old

Question

Quizplus · Accepted Answer

Shield areas in continental interiors are typically flat regions that consist of very old rocks, often over 1 billion years old. These areas have been relatively stable for long periods of geological time and are often surrounded by younger mountain chains. Linear chains of mountains less than 100 million years old (A) are typically found along plate boundaries, whereas shield areas are found within the interior of a continent. Ancient coastal regions that have become abandoned and eroded (B) are not typically associated with shield areas, and flat river valleys that cut through older mountain ranges (C) are associated with erosion of uplifted areas rather than with stable shield regions.

Shield Areas in Continental Interiors Are Characterized By____________