Professor William discusses the classification of rocks based on their formation processes. The video covers magmatic rocks, which originate from magma and can be intrusive or extrusive, with examples like granite and basalt. Sedimentary rocks form from accumulated sediments, with examples such as argilite and sandstone. Metamorphic rocks result from the transformation of existing rocks due to changes in minerals, temperature, and pressure, with examples like marble and gneiss. The video concludes with a call to action for viewers to engage with the content.

What is the main focus of the video?

• Types of weather

• Types of plants

• Types of rocks

• Types of animals

What is the difference between lava and magma?

• Lava is a type of sedimentary rock, magma is a type of igneous rock

• Lava is expelled, magma is found inside the Earth

• Lava is cooler than magma

• Lava is found inside the Earth, magma is expelled

How are intrusive igneous rocks formed?

• By the cooling of lava on the Earth's surface

• By the solidification of magma within the Earth's crust

• By the accumulation of sediments

• By the transformation of existing rocks

Which of the following is an example of an igneous rock?

• Marble

• Sandstone

• Granite

• Limestone

What process leads to the formation of sedimentary rocks?

• Erosion of igneous rocks

• Accumulation and compression of sediments

• Transformation of existing rocks

• Cooling of magma

Which of the following is an example of a sedimentary rock?

• Gneiss

• Basalt

• Argillite

• Granite

What does the term 'metamorphic' mean?

• Transformation

• Sedimentation

• Erosion

• Formation

How are metamorphic rocks formed?

• By the solidification of magma

• By the cooling of lava

• By the accumulation of sediments

• By the transformation of existing rocks due to temperature and pressure changes

Which of the following is an example of a metamorphic rock?

• Basalt

• Granite

• Sandstone

• Marble

What does the teacher encourage viewers to do at the end of the video?

• Buy a textbook

• Subscribe, like, and share the video

• Take a quiz

• Visit a museum