Which feature is a low point or sinkhole surrounded on all sides by higher ground?

Which feature is a low point or sinkhole surrounded on all sides by higher ground?

• A. Plateau with flat top.
• B. Valley that is dry.
• C. Shallow depression in the ground.
• D. Low point or sinkhole surrounded on all sides by higher ground.

Answer: (D)

The main idea here is recognizing a closed depression—a low point that is entirely surrounded by higher ground. When terrain forms a hollow that is encircled on every side, it creates a bowl-like feature often described as a sinkhole or closed basin. That exact description—“a low point or sinkhole surrounded on all sides by higher ground”—is the clearest match for the feature in question. Think about the other terms: a plateau is elevated with a flat top, not a depression. A valley is a low area between hills or mountains, typically elongated and not completely enclosed on all sides. A shallow depression is a small dip, which may not be surrounded by consistently higher ground on all directions. The closed-surrounding condition is what makes the described feature unique.

The main idea here is recognizing a closed depression—a low point that is entirely surrounded by higher ground. When terrain forms a hollow that is encircled on every side, it creates a bowl-like feature often described as a sinkhole or closed basin. That exact description—“a low point or sinkhole surrounded on all sides by higher ground”—is the clearest match for the feature in question.

Think about the other terms: a plateau is elevated with a flat top, not a depression. A valley is a low area between hills or mountains, typically elongated and not completely enclosed on all sides. A shallow depression is a small dip, which may not be surrounded by consistently higher ground on all directions. The closed-surrounding condition is what makes the described feature unique.