The life of the pebble.

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Presentation transcript:

The life of the pebble

The start of the pebble These are pictures of a big sized pebble with angular shape. This type of erosion is called Hydraulic action. Hydraulic action is when the waves force the water into the cracks of the rock, that helps to break it.

then the pebble becomes smoother…

and smoother…

Till it becomes very smooth and rounded When the pebble starts to be more rounded and smoother the type of erosion is called Abrasion. Abrasion is when the waves throw sand and pebbles to the rocks and it wears it away like sandpaper.

solution Solution is when the sea water is slightly acidic and it dissolves soluble material from the rock. This is a result of a pebble with holes on its surface made of limestone or chalk.

then they become smaller… Afterwards the pebbles become smaller and smaller because of Attrition. Attrition is when chunks of rocks get knocked together and are worn into smaller and smaller bits…

…until they become shingle And sand

In conclusion… The life of the pebble!!

Giovanna Giorgalli , Christina Panagi and Antonia Chatzixeni BY: Giovanna Giorgalli , Christina Panagi and Antonia Chatzixeni