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Geology and geography Headlands and bays are usually found together on the same stretch of coastline. Headlands and bays form on discordant coastlines, where bands of rock of alternating resistance run perpendicular to the coast. Bays form where weak (less resistant) rocks (such as sands and clays) are eroded, leaving bands of stronger (more resistant) rocks (such as chalk, limestone, granite) forming a headland, or peninsula. Refraction of waves occurs on headlands concentrating wave energy on them, so many other landforms, such as caves, natural archs and stacks, form on headlands. Wave refraction disperses wave energy through the bay, and along with the sheltering effect of the headlands this protects bays from storms. This effect means that the waves reaching the shore in a bay are usually constructive waves, and because of this most bays feature a beach. A bay may be only metres across, or it could be hundreds of kilometres across. Sometimes bays form where movements of the earth's crust (tectonics) bring areas of land together, or move them apart. Usually these bays are referred to as seas or gulfs and not bays. "Capes and bays geography" is a derogatory term for the approach to teaching geography that requires students to learn by rote the names of large number of geographical features rather than taking a more theoretically driven approach. List of some well-known headlands List of some well-known bays A couple of non-gulfs (actually straits) are: See also | ||||||||||
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