GE­ORGE CARR

World of Knowledge (Australia) - - Letters -

In the ‘How Do You Move A Light­house?’ ar­ti­cle (Oc­to­ber), you say that the coast erodes at a rate of one me­tre per year. So how can the light­house be safe for 150 years if it’s only 40 me­tres away from the sea?

> The Gay Head Light­house on Martha’s Vine­yard in Mas­sachusetts will only col­lapse af­ter 150 years be­cause it’s been moved on top of a vein of hard red clay. This is sig­nif­i­cantly less sus­cep­ti­ble to ero­sion than the rest of the coast, mean­ing it will take a lot longer for the sea to eat un­der the light­house.

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