YOUTUBE: Coastal Erosion and Methods Used to Reduce It

When do beaches experience more erosion?

• During calm weather

• During frequent storms

• During winter

• During summer

What is a slower process than erosion?

• Accretion of sand

• Rising sea levels

• Urbanization

• Dredging

When does accretion of sand tend to happen?

• During storms

• During calm weather

• During high tides

• During low tides

What has a big influence on rates of erosion?

• Natural disasters

• Human activity

• Marine life

• Climate change

What results in sediment being removed from the sea?

• Fishing

• Mining and dredging

• Farming

• Sailing

What do human efforts to deal with coastal erosion include?

• Only successful methods

• A range of options with varying success

• Only natural methods

• Only artificial methods

What materials can groynes be built from?

• Plastic and glass.

• Wood, steel, concrete, rubble, or sandbags.

• Sand and clay.

• Metal and asphalt.

What is a limitation of groynes?

• They are too expensive to build.

• They make the beach look unnatural.

• They increase storm erosion on the down-drift side.

• They prevent all sand movement.

What happens to waves when they hit a seawall?

• They are absorbed.

• They are reflected.

• They increase in size.

• They disappear.

What happens to the base of a seawall over time?

• It becomes stronger.

• It erodes.

• It expands.

• It remains unchanged.