Metamorphic Rocks F2 A level year 1 geology

What are the three principal agents of metamorphism?

• Heat, differential pressure, and deep-sea smokers

• Heat, magma, and sediments

• Heat, pressure, and chemically reactive fluids

• Heat, differential pressure, and time

What is the role of heat in metamorphism?

• It adds catalysts to promote reactions

• It causes minerals to partially melt

• It strips away valence electrons

• It increases atomic vibrations

Which of the following describes foliation in metamorphic rocks?

• Randomly oriented mineral grains

• Distinct banding of light and dark minerals

• Minerals oriented flat and parallel to each other

• Minerals aligned in a circular pattern

What is the protolith/parent rock of marble?

• Shale

• Limestone

• Sandstone

• Granite

Which metamorphic facies is associated with subduction zones?

• Blueschist

• Greenschist

• Amphibolite

• Granulite

What is polymorphism among minerals?

• Minerals with the same chemical formula but different crystal structures

• When the same mineral appears in different metamorphic grades

• Minerals that have the same crystal structures but different compositions

• The few minerals that can have multiple different crystal habits

If you find a metamorphic rock with distinct foliation, what caused the foliation?

• Confining pressure

• Directed stress

• Movement associated with faulting

• Hydrothermal fluids

What is the primary difference between contact and regional metamorphism?

• Contact metamorphism occurs over large areas, while regional metamorphism is localized

• Contact metamorphism is driven by pressure, while regional metamorphism is driven by heat

• Contact metamorphism results in foliation, while regional metamorphism does not

• Contact metamorphism is driven by heat from nearby magma, while regional metamorphism is driven by pressure and heat over large areas

Which mineral is commonly used to determine the temperature and pressure conditions of metamorphism?

• Quartz

• Garnet

• Feldspar

• Calcite

What is the significance of index minerals in metamorphic rocks?

• They indicate the original composition of the protolith

• They are used to determine the age of the rock

• They are the most abundant minerals in metamorphic rocks

• They help in identifying the metamorphic grade of the rock