How would the earth be different if the crust was at most 1km thick?

Currently, the crust varies from 4km (oceanic) to 10km (continental) to 30km (mountains).

How would the earth be different if it was all 1/4 the thickness? So it was 1km, 2km and 7km?

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How would the earth be different if the crust was at most 1km thick?

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