Coastal Geography and Erosion Concepts

The video tutorial explores the effects of wind erosion on sand dunes, highlighting how wind transports sand grains, leading to dune migration. It also examines the impact of wind erosion on man-made structures, demonstrating how continuous sand impact can cause damage. The concept of longshore drift is introduced, explaining how waves carry sediment along the shoreline, and the use of jetties to prevent beach erosion. Finally, the video discusses sediment abrasion, which smooths sediments and forms beaches, and contrasts the sandy beaches of Long Island's south shore with the cobbly beaches of the north shore due to glacial deposits.

What is the primary reason sand dunes migrate over time?

• Wind blowing sand from the steep side to the shallow side

• Wind blowing sand from the shallow side to the steep side

• Water currents moving sand

• Human activity reshaping the dunes

Why can't wind pick up larger sediments?

• Larger sediments are protected by vegetation

• Wind only affects water, not land

• Larger sediments are glued to the ground

• Larger sediments are too heavy for the wind to lift

What happens to structures when sand is continually blown against them?

• They change color

• They erode and break down

• They become stronger

• They grow larger

What is Longshore drift?

• The movement of sand dunes inland

• The deposition of sediment by rivers

• The movement of sediment along the shore due to angled waves

• The erosion of cliffs by waves

How do jetties help prevent beach erosion?

• By redirecting river flow

• By increasing wave energy

• By removing sediment from the beach

• By trapping sediment on one side

What causes the smoothness of beach sediments?

• Chemical reactions with seawater

• Heat from the sun

• Pressure from beachgoers

• Abrasion from wave action

What is sea glass, and how is it formed?

• Glass formed by chemical reactions in the ocean

• Glass created by volcanic activity

• Glass smoothed by wave abrasion

• Glass made by sea creatures

What is the primary difference between the South and North Shores of Long Island?

• The South Shore has more vegetation

• The North Shore is warmer

• The North Shore has more wildlife

• The South Shore has sandy beaches, while the North Shore has cobbly beaches

What is the origin of the sandy beaches on Long Island's South Shore?

• Direct glacial deposits

• Volcanic activity

• Glacial outwash

• River sediment

Why are the beaches on the North Shore of Long Island cobbly?

• They are formed by volcanic activity

• They are direct glacial deposits

• They are man-made

• They are eroded by strong winds