Geography Cliffs and Seaside Online Quiz

The narrowest part of the English Channel is across the Strait of Dover, which is approximately 21 miles (about 33 kilometers) wide. The other options are far too narrow or too wide.

Little Hangman is the highest cliff among the options listed, standing at 218 meters (718 feet) on the Exmoor coast. While Great Hangman is the highest cliff in England overall, Little Hangman is still significantly taller than the White Cliffs of Dover or the Seven Sisters.

Coastal cliffs collapse primarily because waves erode the base of the cliff, creating a wave-cut notch. Over time, the lack of support causes the overhanging cliff to collapse under gravity.

The chalk that forms the White Cliffs of Dover was deposited during the Late Cretaceous period, approximately 70 million years ago. This chalk is made of the skeletal remains of tiny algae called coccoliths.

"Big Mama" is a famous giant wave peak located in Nazaré, Portugal, known for producing some of the largest surfable waves in the world. The other options are humorous or incorrect names.

Sand is primarily formed by the weathering and erosion of rocks over long periods, where waves and wind break down larger rocks into tiny grains. Option A correctly identifies this process of waves breaking down rocks.

Sea caves are formed by the forces of marine erosion, where waves continuously strike weaknesses or cracks in the cliff face. Over time, this hydraulic action and abrasion hollow out the rock to form a cave.

Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. Option D provides the standard scientific definition of this process.