Why Does Removal of Logs and Rocks from a Beach

question 33

Multiple Choice

Why does removal of logs and rocks from a beach endanger the sea cliffs behind them?

• A) Waves can't get over the logs to get to the sea cliffs.
• B) Waves have to be higher to reach over the logs and rocks to reach the sea cliffs.
• C) Wave energy is taken up in moving the logs and rocks.
• D) Logs bouncing up and down on the beach pound the grains together, making them more difficult to erode.
• E) Logs and rocks break up the direct forward thrust of the waves, making them more erratic.

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Definitions:

Subduction

The process where one tectonic plate moves under another and sinks into the Earth's mantle, often associated with volcanic activity and earthquakes.

Oceanic Plate

A section of the Earth's lithosphere that exists beneath the oceans, thinner than continental plates but denser, formed at mid-ocean ridges.

Andes of South America

A major mountain range stretching along the western edge of South America, known for its volcanic activity and diverse ecosystems.

Tectonic Setting

The geological and geographical conditions resulting from the movement and interaction of the Earth's tectonic plates.