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The statement "The present is the key to the past" is referred as：
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The picture shows here is the angular unconformity found by James Hutton.
The best way to determine the true shape of a continent is to trace the outer boundary of its continental shelf.
Transform fault boundaries are located where plates grind past each other without either generating new lithosphere or consuming old lithosphere.
Along some divergent plate boundaries, oceanic crust is being consumed in subduction zones.
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