Question

How many of the following are the rocks which are formed when existing rocks change due to heat or
pressure?
(i) Gneiss
(ii) Marble
(iii) Conglomerate (iv) Limestone
(v) Shale
(vi) Slate
(vii) Granite
(viii) Sandstone
(ix) Mudstone (x) Basalt
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Answer 1

Answer:

Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.