4. How does the author present the Grand Canyon and the Carlsbad Caverns?

A as effects of landslides

B. as geological mysteries

C. as negative effects of erosion

D. as positive effects of erosion

Option D.

As positive effect of erosion.

Explanation:

Grand Canyon and the Carlsbad Caverns is a cave park in New Mexico which serve as tourist attraction and relaxation centre.

Erosion is the removal of top soil, rock or dissolved material from the surface of the Earth by wind or water flow. Erosion has positive effect. It wash away parasites and breakdown rocks.Grand Canyon and the Carlsbad is formed by process of erosion which was as a result of rock break down and deposition.

D. as positive effects of erosion

Explanation:

Erosion is the washing away of top soil. It makes land get eroded of nutrients that are available in the top soil.

Eroson as a positive effect of grand cravens as the eroded materials are often depoited at the base of the floor. All the eroded materials are deposited and solidifies to form the canyons and carberns.