Transcript sea caves - Cloudfront.net

10.1 Shoreline Erosion & Deposition
• sea stacks – offshore rocks that have been
separated from the shore by weathering and
erosion (come from sea arches)
• sea arches – a sea cave that has been cut all
the way through to the back by weathering and
erosion (come from sea caves)
• sea caves – waves continuously weather and
erode rock from a cliff on the shore creating a
hole (come from headlands/cliffs)
10.1 Shoreline Erosion & Deposition
• headlands – similar to cliffs – they form
when cliffs of hard rock erode more slowly
than the surrounding softer rock does
• wave-cut terraces – form when a sea cliff
is worn back from the shores, which
produces a nearly level beach beneath the
base of a cliff
10.1 Shoreline Erosion & Deposition
• How can ocean beaches get more sand?
– Through deposition
– Rivers could end at the ocean, slowing down,
and depositing sediment, creating a delta
– Longshore currents can erode water and sand
where the water speeds up and deposit more
sand where the water slows down
• longshore current – eroding sediment and
water near the shoreline of the ocean
10.1 Shoreline Erosion & Deposition
• shoreline – a place where land and a body
of water meet (i.e. at the beach)
• beach – any area of shoreline that is made
up of materials deposited by waves
• undertow – after the waves crash on the
beach the water flows back to the ocean
underneath new incoming waves carrying
sand and rock away from the shores