Wave Erosion 16.2 Review
Mar 27, 2015
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