Recrystallization occurs because thermal energy

14. Recrystallization occurs because thermal energy causes atoms to vibrate rapidly, break
existing chemical bonds, and migrate to new positions on the crystal lattice where they
are more stable under the hotter conditions
✓ True —this process doesn’t change the identity or chemical composition of the
mineral; it just produces larger crystals of the mineral
● False
15. Roofers use the rock schist to shingle roofs because its foliation, called schistosity, causes
it 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 be
metamorphosed into the mineral mica, which is a chief component of the
metamorphic rock schist
18. Which is NOT a cause of banding in gneiss?
—preferential orientation can impart foliation to a rock but
cannot cause the compositional banding that de?nes a gneiss
19. Marble is a favourite material of sculptors because of its relative softness, and uniform
texture.
like a slate or schist. Also imagine what it would be like trying to sculpt quartz or
quartzite, which are harder than steal and would destroy tool
20.Blueschist is a common metamorphic rock of continental shields

– blueschist is a rare, blue-coloured rock formed under high pressure, low
temperature conditions that are found in accretionary prisms adjacent to subduction
zones.
21. If the intrusion of magma (a pluton) melts ma?c country rock, the resulting
metamorphic rock is a schist or gneiss.