Wave Erosion 16.2 Review.

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Presentation transcript:

Wave Erosion 16.2 Review

Headlands Resistant rock left that projects into the ocean Typically granites or very very resitant sandstone

Sea Caves

Sea Arch

Sea Stacks Offshore isolated columns of rock that were once attached to a headland

Shoreline Erosion- large waves during storms hit the shore so hard that it pulls the rock off and into the ocean. Sea Cliffs- a steep structure of rock located where waves strike directly against rock. Sea Caves, Arches, and Stacks-large holes along the base of a sea cliff, offshore isolated columns of rock. Terraces- a level platform underneath the water at the base of a sea cliff. - Wave-cut terrace Wave-built terrace-an extension of a wave-cut terrace.

Terraces Wave-cut- when sea cliffs retreat, terraces are built due to erosion by waves wave-built- due to material being eroded away from retreating terraces, those deposits may accumulate to build terraces

Coastline and sea level changes-the sea level rises and falls depending on the amount of ocean water. Coastline and Land Changes- Coastlines can be flooded if land sinks, and can be exposed if the land rises. Submergent Coastlines- formed when the sea level rises or land sinks. Inlets between land. Emergent Coastlines- formed when land rises or sea level falls.

Ancient wave-cut terraces

Beaches- depositions of sand along an ocean shore. -composition depends on the source rock. Berm- the raised section on most beaches. Sand Bar- underwater ridges. Longshore-Currents are created by waves moving at an angle to the shoreline push water along the shore. Spit- a long narrow deposit do sand at one end of the shore. Tombolos-connections from offshore islands to main lands.

Green Sand?

Longshore currents

Barrier Island- long narrow offshore ridges of sand. Coral Reefs- coastal features that are homes to small marine animals that live in warm shallow sea water. -fringing reef-around the coast of an island. -barrier reef-coral offshore around the remaining of the volcano. -atoll-circular coral reef surrounding a shallow lagoon.

Barrier Island

Barrier Reef

Fringing Reef

Atoll