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14. Recrystallization occurs because thermal energy causes atoms to vibrate rapidly, breakexisting chemical bonds, and migrate to new positions on the crystal lattice where theyare more stable under the hotter conditions✓True—this process doesn’t change the identity or chemical composition of themineral; it just produces larger crystals of the mineral●False15. Roofers use the rock schist to shingle roofs because its foliation, called schistosity, causesit to break in convenient size.16. The mineral sillimanite indicates higher-grade metamorphism than staurolite.at higher metamorphic grade than staurolite.17. Schist is a medium-grade foliated metamorphic rock that normally contains micas.✓True – many di뮎erent types of rocks are composed of atoms that can bemetamorphosed into the mineral mica, which is a chief component of themetamorphic rock schist18. Which is NOT a cause of banding in gneiss?—preferential orientation can impart foliation to a rock butcannot cause the compositional banding that de?nes a gneiss19. Marble is a favourite material of sculptors because of its relative softness, and uniformtexture.like a slate or schist. Also imagine what it would be like trying to sculpt quartz orquartzite, which are harder than steal and would destroy tool20.Blueschist is a common metamorphic rock of continental shields
– blueschist is a rare, blue-coloured rock formed under high pressure, lowtemperature conditions that are found in accretionary prisms adjacent to subductionzones.21. If the intrusion of magma (a pluton) melts ma?c country rock, the resultingmetamorphic rock is a schist or gneiss.