Longshore Drift and Coastal Erosion

The video explains how Longshore drift affects beaches, causing sand and pebbles to move along the coast. Waves hitting the beach at an angle, driven by prevailing winds, move particles up and down the beach. This process can change the shape of beaches over time. Groins are structures built to trap material and prevent erosion, although they don't completely stop the movement of sand and pebbles.

What is the length of the beach located just north of Abist?

• 1 km

• 2 km

• 4 km

• 3 km

What natural process is responsible for moving sand and pebbles along the beach?

• Tidal waves

• Erosion

• Longshore drift

• Sedimentation

How do waves contribute to Longshore drift?

• By hitting the beach at an angle

• By causing erosion

• By hitting the beach directly

• By creating tides

What role does gravity play in Longshore drift?

• It stops the movement of particles

• It has no role

• It pushes particles up the beach

• It pulls particles back into the sea

What can be observed in the water even during small waves?

• Sand particles

• Seaweed

• Large rocks

• Fish

What is the purpose of building groins on beaches?

• To create fishing spots

• To enhance wave action

• To trap material and prevent erosion

• To attract tourists

How many groins have been built to protect the beach from Longshore drift?

• 60

• 30

• 45

• 75

What happens to pebbles and sand despite the presence of groins?

• They remain stationary

• They get swept over or around the groins

• They disappear completely

• They form new beaches