Question

Which of the following is an example of a concave structure?

A[mesa]incorrect answer
B[crater]incorrect answer
C[ocean]incorrect answer
D

Answer 1

An example of a concave structure is a spoon or a cave. In a concave structure, the surface curves inward, creating a hollow or a depression. A spoon's concave shape allows it to hold liquids, while a cave's concave shape creates a natural shelter.