Module 4 - Metamorphism

What causes changes in the composition of a rock during the process of metamorphism?

• increase in pressure

• increase in temperature

• reaction with hydrothermal fluids

• All of these.

Which of the following is the process exhibited by parallel alignment of mica in a metamorphic rock?

• metasomatism

• bedding

• porphyroblasts

• foliation

What type of metamorphic rock will form if a mudrock experiences high-grade metamorphism?

• Gneiss

• Phyllite

• Schist

• Slate

Which of the following statements about the metamorphism of limestone is FALSE?

• With increasing metamorphism, the calcite minerals form a larger crystal.

• With increasing metamorphism, the amount of water decreases.

• With increasing metamorphism, the grain size of the minerals gets smaller.

• With increasing metamorphism, foliation develops.

Which of the following is TRUE about contact metamorphism?

• It is prominent in areas where surrounding rocks are exposed to heat coming from magma intrusion.

• It takes place when heat and shock waves are formed from meteor or asteroid impact.

• Pressure has an important role in the transformation of rocks in contact metamorphism.

• It occurs within the continental crust.

Which of the following transformations is directly related to pressure in producing metamorphic rocks?

• formation of foliation

• change mineralogical in the rock

• the increasing size of mineral crystals

• change in mineral composition of the rock

Which of the following metamorphic rocks would NOT come from mudrock?

• Marble

• Slate

• Gneiss

• Schist

What process contributes to the metamorphism of oceanic crust at the zone of spreading ridge?

• Dissolved minerals in the water confined within the rocks react with the heat and trigger a chemical reaction.

• Minerals present in the ocean water percolate through the rocks and become deposited within the rocks while replacing other minerals.

• The heat coming out from hydrothermal vents under the ocean heats the rock which leads to recrystallization of the original mineral content of the rock.

• Interaction of plates below the spreading oceanic crust creates horizontal movements and deforms the rocks within leading to formations of foliations and cracks.

Tags

NGSS.HS-ESS1-5

Rigel argued with his classmates that the rock that he found in the campsite near the foot of the Taal volcano was a metamorphic rock. Others claimed that it was a volcanic rock because it was found near a volcano hence, an igneous rock. What features of the rock would have convinced Rigel that it was a metamorphic rock and not an igneous rock?

• The minerals in rocks are almost invisible to be seen.

• The rock contains bits of old shells of snails and wood.

• The surface of the rock has holes similar to Swiss cheese.

• The rock contains interlocking and large crystals of minerals compared to minerals found in igneous rocks.

Diamonds are minerals made through a process like metamorphism which results in a very dense arrangement of carbon atoms. What type of metamorphism would create a diamond?

• Contact metamorphism

• Burial metamorphism

• Shock metamorphism

• High-pressure metamorphism