Metamorphism

What is the process of changing the characteristics of a rock caused by changes in temperature, pressure, or volatile content?

• metamorphism

• lithification

• recrystallization

• rock cycle

What is the correct term used to refer to the pre-existing rock that undergoes metamorphism?

• gneiss

• schist

• rock

• protolith

Which of the following statements is not true about metamorphism?

• Metamorphism usually occurs during burial, tectonic movements, heating and presence of chemically active fluids.

• Metamorphism can range from slight to considerable changes in the parent rock.

• Metamorphism occurs when there is an increase in temperature and pressure which results to melting of rocks.

• Metamorphism of the protolith changes the texture and mineralogy of the original rock.

Tags

NGSS.HS-ESS2-3

What will happen if the the temperature-pressure conditions exceeds the requirement for metamorphism?

• Rocks will melt and form igneous rocks.

• Rock will be changed into another metamorphic rock.

• Rocks will begin to weather and undergo erosion.

• Rocks will be compacted and cemented by heat.

Tags

NGSS.HS-ESS2-1

Which of the following processes refers to the formation of new minerals from the decomposition of old minerals?

• recrystallization

• neocrystallization

• phase change

• pressure solution

Which of the following statements is true during the process of phase change?

• It is characterized by the melting and recrystallization of mineral grains exposed to changes in pressure.

• It occurs slowly due to the change in mineral’s size and shape as it forms a more crystalline structure.

• It usually occurs when rocks are squeezed in one direction with the presence of water.

• It occurs when there is a change in mineral structure while retaining the same chemical composition.

What happens to rocks during plastic deformation?

• Rocks are deformed resulting to larger crystals.

• Rocks tend to exhibit partial melting.

• Rocks start to behave as a brittle material.

• Rocks tend to stretch instead of breaking.

Which refers to the relative temperature and pressure conditions during the formation of metamorphic rocks?

• retrograde

• metamorphic grade

• prograde

• protolith

Which of the following processes occurs when temperature and pressure are decreased and begins to require addition of hydrothermal fluids or water?

• prograde metamorphism

• regional metamorphism

• retrograde metamorphism

• dynamic metamorphism

What is usually formed during dynamic metamorphism?

• mylonites

• hornfels

• stishovite

• gneiss