Describe how sea caves are formed. (P. 48)

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Presentation transcript:

Describe how sea caves are formed. (P. 48) Waves strike the headland first. Waves refract around the headland and put hydraulic pressure on the sides of the headland.

Describe how sea caves are formed. (P. 48) The hydraulic pressure rips away sections of weakened rock. Erosion of the weak portions create caves & blow holes in the sides of the headland.

Describe how sea arches are formed. (P. 48) Most sea arches are formed from the wave erosion of a headland where the backs of two caves have met and broken through. a complete passage way or tunnel or “arch” through the head land !!

It is difficult to see or imagine from the top view. However the side view provides a better picture.

Sea Arch - England

Jackson’s Cove, Green Bay NL.

Sea Arch Parson’s Pond, Northern Pen., NL

Sea Stack Isolated pillar of rock that has become separated from a headland by coastal erosion. It is usually formed by the collapse of an arch. Further erosion will reduce it to a stump, which is exposed only at low tide.

Describe how sea stacks are formed. (P. 48) Continuous erosion causes the collapse of the ground over the arch. This leaves a pillar or column or “STACK” of land standing alone where the headland was. Sea stacks are common in eastern Canada. Many have plant growth on top.

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Analyze the processes that result in the straightening out” of an irregular coastline. (P. 42 questions # 11 & 12) [submerged] Weathering of Headland What forces cause the weathering & erosion? Hydraulic Corrosive Abrasive 2. Transportation of silt How is silt transported? Longshore Drift Waves Currents 3. Deposition of silt Where does deposition occur? Bay beaches; filling inlets Bay bars; closing off inlets 4.Summary: Submerged coasts straighten due toweathering And erosion.

Analyze the processes that result in the straightening out” of an irregular coastline. (P. 48) [emerging] Emerging coastlines straighten in much the same fashion as submerging coastlines. Weathering and Erosion of headlands creates sea caves, sea arches and sea stacks instead of bay beaches, spits & bay bars. However the result is similar in that headlands are reduced in size.

Longshore drift

Longshore drift