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Metamorphic rocks
Igneous and sedimentary rocks that have been altered from their previous condition through the combined action of heat and pressure below Earth's surface are called metamorphic rocks and the process is called metamorphosis. The changes so brought about are both physical and chemical in character, which alter the structural features of rocks. Many times both the structural features and composition of original rocks are affected simultaneously. In some cases the metamorphism is so pronounced that the new rock looks quite different from the original. The action of water tends to remove some material from, or to introduce new material like silica, lime or iron oxides.
Other visible light hazards : Ordinary, visible light can present a hazard under certain conditions. You can burn paper by focussing the sun's rays using a small magnifying lens.
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Using what you know about the energy—matter relationship, explain why the ecosystems with the greater amount of overall energy tend to have a greater number of organisms.
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when one moves from bright to dark place, chairs are not seen at ones. why?
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