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THE SEA LEARNING OUTCOMES. TODAY WE ARE GOING TO LEARN ABOUT THE ACTION OF THE SEA . AT THE END OF THIS CHAPTER YOU WILL BE ABLE TO DISCUSS THE DIFFERENT WAYS THE SEA CAN ERODE, DEPOSIT AND TRANSPORT ITS LOAD.

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the sea learning outcomes

THE SEALEARNING OUTCOMES

TODAY WE ARE GOING TO LEARN ABOUT THE ACTION OF THE SEA .

AT THE END OF THIS CHAPTER YOU WILL BE ABLE TO DISCUSS THE DIFFERENT WAYS THE SEA CAN ERODE, DEPOSIT AND TRANSPORT ITS LOAD.

YOU WILL BE ABLE TO IDENTIFY MANY OF THE FEATURES FOUND ALONG THE COASTLINE AND DESCRIBE HOW THEY WERE FORMED

the sea
THE SEA
  • LOOK AT THE MAP IN YOUR GEOGRAPHY BOOK.
  • SEAS AND OCEANS ARE REPRESENTED BY THE COLOUR…BLUE
  • WHAT PERCENTAGE OF THE WORLD IS SEAS/OCEANS?
fetch and waves
FETCH AND WAVES
  • NO THIS IS NOT SOMETHING WE DO WITH OUR DOG 
  • When wind blows over the sea it causes waves
  • The size of a wave depends on its fetch. The fetch is the distance a wave travels. The greater the fetch, the larger the waves
how waves erode
How waves erode
  • Waves erode in 4 ways
  • Hydraulic action
  • Abrasion
  • Attrition
  • Compressed air
waves
waves
  • Waves can be constructive  or destructive 
  • When a wave breaks on the shore it is called SWASH
  • When the wave retreats back to the sea this is called BACKWASH
the sea erodes the coastline and this is what it creates
The sea erodes the coastline and this is what it creates
  • Cliffs
  • Wave-cut platform
  • Bays and headlands
  • Sea cave
  • Sea arch
  • Sea stack
  • Blow holes
workbook page 24
WORKBOOK PAGE 24
  • COLUMN 1COLUMN 2
  • WAVES THEY CAN BE CONSTRUCTIVE/DESTRUCTIVE
  • FETCH IN IRELAND IT HAS SW DIRECTION
  • PREVAILING WIND LENGTH OF SEA OVER WHICH WAVE PASSES
  • SIZE OF WAVES INFLUENCED BY STRENGHT OF WIND

COLUMN 1COLUMN 2

A. SWASH THEY CAN CAUSE EROSION ALONG COAST

BACKWASH WATER RUSHING TOWARDS THE SHORE

CONSTRUCTIVE WAVES WATER MOVING BACK DOWN SHORE

DESTRUCTIVE WAVES THEY CAN TRANSPORT AND DEPOSIT

workbook page 25
WORKBOOK PAGE 25
  • COLUMN 1 COCLUMN 2
  • A. ABRASION WAVES HITTING COAST
  • B. ATTRITION ROCKS AND STONES ERODING
  • C. HYDRAULIC ACTION AIR TRAPPED IN CRACKS IN ROCKS
  • D. COMPRESSED AIR ROCKS BROKEN DOWN AND ROUNDED
  • DESCRIBE THE FORMATION OF CLIFF USING FOLLOWING WORDS/CHART
  • OVERHANG COLLAPSES MATERIAL IS REMOVED PROCESS REPEATED
  • COASTLINE RETREATS NOTCH IS CUT BY EROSION
cliffs
cliffs
  • Cliffs are vertical slopes along the coast
  • When the waves hit the coast, rocks are hurled against the cliff wall.
  • They create a notch (hole) at the base of the cliff which becomes deeper.
  • Eventually the overhanging rock collapses and the cliff retreats back
  • Over time it leaves a rock platform called a wave-cut platform
2 bays and headlands
2. BAYS AND HEADLANDS
  • A bay is a wide, curved opening into the coast
  • A headland is a neck of land that juts out into the sea
sea caves1
Sea caves
  • A sea cave is a tunnel that is found at the base of a cliff
  • The waves attack the rock by hydraulic action, abrasion and compressed air.
  • The crack develops into a small cave eventually
sea arch1
Sea arch
  • When a headland is eroded by the sea, it forms a small cave.
  • Erosion continues to enlarge the cave eventually forming a passage way through to the other side of the headland
  • Sometimes there can be a cave on both sides of the headland and they meet in the middle to form a sea arch
a sea stack
A sea stack
  • A sea stack is like a large pillar standing in the sea
  • It is formed from a sea arch.
  • The roof of the cave has nothing to support it so it eventually collapses leaving a pillar called a …………
blowholes
blowholes
  • When a cave is formed at the base of a cliff, it is continually eroded by the action of the sea
  • The roof of the cave is eroded by rocks and by compressed air.
  • Trapped air expands under pressure to cause a mini explosion in the roof of the cave
  • Eventually the roof of the cave collapses forming a blowhole
longshore drift
Longshore Drift
  • The waves approach the beach at a 45 degree angle
  • The swash deposits the heavier material on the beach
  • The lighter material is carried back out to sea by the backwash
  • This process is repeated and material is transported along the coast
features of deposition
Features of deposition
  • So far we have looked at how the action of the sea causes coastal erosion and transportation called…….what’s that word I told you NOT to remember yesterday

hhhhhmmmm….Long

a beach and a stormbeach
A beach and a stormbeach
  • What is a beach????
  • It is a build up of sand and shingles deposited between low and hide tide
  • What is a stormbeach?
  • When the weather is stormy the sea has more energy and it can hurl large stones and rocks even further than normal on the beach
  • These rocks are too heavy to be carried by to sea by the backwash so they remain there
what are sandunes
What are sandunes??
  • Wind and sandblows in from

the sea

  • It dries the sand on the

beach making it lighter

it can get trapped in

Vegetation on the beach and it piles up to form

Sand dunes

what is a sand spit and how is it formed
What is a sand spit and how is it formed??
  • A sand spit is a ridge of sand that extends across a bay
  • It is caused by LONGSHORE DRIFT.
  • When the coastline changes, longshore drift loses some of its energy and it deposits its load. (it doesn’t have the energy to bring it back out to sea)
  • Eventually all the material builds up above sea level
  • The process continues and the sand spit extends all the way across the bay to form a SAND BAR
people and the sea
People and the sea
  • The sea plays an important role in human activities.
  • Can you think of 3 ways the sea is important?
slide41

1. Recreation

A range of activities includes boating, swimming, fishing and sunbathing

2. Transport

Ships can transport bulky cargo across the world. People can travel on car ferries.

3. Food supply

Fishing provides us with food. It also creates employment for: fisherman, fish processing factories and in workers in fish shops.