Question 1 (10 points) Nonfoliated metamorphic rocks most commonly form when par

Question

Question 1 (10 points) Nonfoliated metamorphic rocks most commonly form when parent rocks: a) Are exposed to sudden pressure due to meteorite impacts b) Are exposed to strong, directed pressure and high temperatures c) Contain only platy minerals that are high in water content d) Contain no platy minerals or are not exposed to directed pressure Save Question 2 (10 points) What rock characteristic do geologists use to identify metamorphic facies? a) Grain size b) Type of metamorphism c) Foliation d) Mineral assemblages Save

Explanation / Answer

1) d) Contain no platy minerals or are not exposed to directed pressure .

Note : Nonfoliated metamorphic rocks are not formed from parent rocks which contain platy minerals(fine grained) . Nonfoliated metamorphic rocks contain  coarse grained minerals .

Nonfoliated metamorphic rocks are formed when parent rocks are exposed to equal pressure in all directions. Foliated metamorphic rocks are formed when parent rocks are exposed to unequal pressure (directed pressure) in all directions.

  

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