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...become buried beneath further layers, the sediments become cemented to form hard rocks. If you look in the cliffs you may be able to pick out these layers – hard layers will stick out of the cliff whilst soft layers will form notches because they are less resistant to the erosive forces of the wind and waves. Sometimes these layers may be tilted, or even crumpled and...

...become tanned? Tanning shows the reaction of our skin in defending itself against harmful rays from the sun. UVA light stimulates melanin production - and tanning - due to its ability to penetrate into deep layers of the skin. The melanin in our skin, produced by melanocytes, is a chemical pigment that absorbs UV rays, thus limiting the penetration into the skin tissues....