GEOLOGY
CRYSTALLOGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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-mostly formed under water-it has remains of plants and animals-made of smaller particles
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-it has metals and mineral-it is called primary rocks
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-they are very hard-marble, slate
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None of the above
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Detailed explanation-1: -Metamorphic rocks were once igneous or sedimentary rocks, but have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth’s crust. They are crystalline and often have a “squashed” (foliated or banded) texture.
Detailed explanation-2: -Metamorphic rocks are almost always harder than sedimentary rocks. They are generally as hard and sometimes harder than igneous rocks. They form the roots of many mountain chains and are exposed to the surface after the softer outer layers of rocks are eroded away.
Detailed explanation-3: -Metamorphic rocks are often intimately related to large-scale (kilometres of tens of kilometres) structural features of Earth. Such features include folds, nappes, and faults with a wide variety of geometries.
Detailed explanation-4: -Slate is a metamorphic rock of sedimentary origin. Is mainly composed of quartz, sericite and minerals of the chlorite group.