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    Geography...How is a stack formed at the sea?
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    1) On a headland there is a crack/weak point in the rock
    2) Water then erodes this crack (through Hydraulic Action) making it bigger into a cave
    3) This gap gets bigger & bigger through erosion & creates an arch
    4) The top part of the arch has no rock underneath it so falls under gravity as it is unsupported
    5) This leaves a stack
 
 
 
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Updated: November 18, 2017
Poll
“Yanny” or “Laurel”

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

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