10.1 Shoreline Erosion & Deposition

1. 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)

2. 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

3. 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

4. 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