RIVERS AND COASTS

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RIVERS AND COASTS

• By Daniel Homer

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CONTENTS

• BIRTH OF A RIVER
• Stream of the Severn
• Water cycle
• Meanders
• Erosion of a river
• DELTAS
• COASTS

• EROSION OF A COAST
• UNDERCUTS
• HEADLANDS
• TIDAL LINE
• SEA GROYNES
• GOOD BYE!!

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Birth of a river

• This river began as a spring.(1)
• Not all rivers start as a spring, the river
  SEVERN started as a bog!!! (2)
• (1) (2)

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Stream of the Severn

• The water starts to flow out of the bog and turns
  into a little stream.

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Water cycle

• This is a picture of the water cycle. The water
  from the sea is evaporated into the air, forms
  clouds and goes back to the sea.

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Meanders

• A meander is when a river does some dramatic
  turns.(1)
• (1)

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Erosion of a river

• Erosion is when a river cuts into the side of a
  bank and the earth e. g. trees, mud, grass.

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Erosion of a river

• Estuary If a river has a wide mouth, this is
  called an estuary. The river carries a lot of
  sediment as it travels from its source to its
  mouth. When the fresh water from the river meets
  the salty water from the sea, the river drops its
  sediment. Most is then washed away by the sea,
  the river and the tides. An estuary has a mixture
  of salty and fresh water. The fresh water from
  the river extends out into the sea. Some of the
  salty water from the sea travels up the river
  mouth. This mixture of salt and fresh water is
  called brackish water.

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DELTAS

• Delta FormationRivers move slowly at the river
  mouth. The river carries a lot of sediment and
  mud. The river deposits (drops) its sediment and
  mud at its mouth. This sediment and mud spreads
  out into a fan- like shape, or delta, across the
  mouth of the river. If the force of the sea tides
  and water is not very strong, the mud deposits
  cannot be washed away. Instead, the deposits
  break up the flow of the river water into many
  smaller channels. The delta gradually gets bigger
  and bigger. The new land is made up of billions
  of pieces of mud, sediment and small rocks. This
  sediment has been carried by the river from its
  source to its mouth.

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COASTS

• ALL COASTS ARE DIFFERENT IN EVERY WAY. LOOK AT
  PIC(1) A NICE BEACH, NOW LOOK AT PIC (2).
• (1) (2)

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EROSION OF A COAST

• WAVES ARE A VERY POWERFUL FORCE. LOOK WHAT THE
  WAVES DID TO THIS ROCK!! ERODED A GIANT HOLE IN
  IT.

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UNDERCUTS

• THE SEA CAN ERODE ROCKS, IT ALSO CUTS INTO ROCKS.
  YHE ROCK, WEAK COLAPSES INTO THE SEA.

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HEADLANDS

• A HEADLAND IS WHERE A PIECE OF LAND STICKS OUT
  INTO THE SEA. THIS IS WHEN LAYERS OF SOFT ROCK IS
  ERODED BUT LEAVES THE HARD ROCK WHERE IT IS. THIS
  PICTURE SHOWS THE CLIFF OF A HEADLAND.

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TIDAL LINE

• A TIDAL LINE IS WHERE THE SEA CAME IN. SEE,
  DIFFERENT TIDAL LINES. THATS BECAUSE THE SEA
  CHANGES!!!

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SEA GROYNES

• SEA GROYNES ARE USED ON BEACHES WHERE THE SURFACE
  IS LOOSE. THEY ARE DESIGNED TO KEEP THE SURFACE
  STABLE.

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GOOD BYE!!

• THANKS FOR LOOKING AT MY PRESENTATION. I HOPE IT
  WAS GOOD!!