The video tutorial explores the formation of metamorphic rocks, which are created when sedimentary or igneous rocks are subjected to high pressure and temperature, causing them to recrystallize. It explains the concept of metamorphism, the conditions under which it occurs, and the classification of metamorphic rocks into low, medium, and high grades. The tutorial also discusses the transformation of mudstone into slate, phyllite, schist, and gneiss, highlighting the changes in mineral composition and structure at each stage.

What is the primary process that transforms igneous rocks into sedimentary rocks?

• Crystallization

• Uplift and weathering

• Metamorphism

• Melting

What is metamorphism primarily caused by?

• Erosion

• Increased pressure and temperature

• Sedimentation

• Melting of rocks

At what temperature does metamorphism typically begin?

• 100 degrees Celsius

• 200 degrees Celsius

• 400 degrees Celsius

• 300 degrees Celsius

What is the defining feature of low-grade metamorphic rocks?

• Development of cleavage

• Presence of garnet

• Melting of minerals

• Formation of quartz

Which rock is known for its good cleavage and is used as a building stone?

• Phyllite

• Gneiss

• Schist

• Slate

What mineral transformation occurs in medium-grade metamorphism?

• Clay to quartz

• Quartz to feldspar

• Muscovite to chlorite

• Clay to muscovite and chlorite

What is the appearance of phyllite due to its mineral composition?

• Dull and rough

• Dark and opaque

• Glittery and lustrous

• Transparent and smooth

What is a characteristic feature of high-grade metamorphic rocks?

• Uniform mineral distribution

• Segregation of mafic and felsic minerals

• Presence of only one mineral type

• Lack of foliation

Which rock is characterized by alternating bands of light and dark minerals?

• Gneiss

• Schist

• Phyllite

• Slate

What happens to chlorite and muscovite at high-grade metamorphism?

• They react with quartz to form new minerals

• They become stable

• They melt into magma

• They remain unchanged