Types and Formation of Rocks

The video tutorial explains the three main types of rocks: igneous, metamorphic, and sedimentary. Igneous rocks form from cooled magma or lava, with intrusive types having larger crystals due to slower cooling. Metamorphic rocks are created under heat and pressure, transforming existing rocks without melting them. Sedimentary rocks are formed from compressed layers of eroded materials, often containing fossils. The tutorial highlights the processes and characteristics of each rock type, providing a foundational understanding of geology.

What are the three basic types of rocks?

• Igneous, Metamorphic, and Sedimentary

• Igneous, Metamorphic, and Granite

• Sedimentary, Marble, and Igneous

• Metamorphic, Sedimentary, and Quartz

What is magma called when it reaches the Earth's surface?

• Sediment

• Rock

• Lava

• Crystal

What type of igneous rock forms when trapped magma cools slowly?

• Metamorphic

• Extrusive

• Intrusive

• Sedimentary

Why do extrusive igneous rocks have smaller mineral grains?

• They are under high pressure

• They contain more minerals

• They are formed from sediment

• They cool quickly near the Earth's surface

What causes rocks below the Earth's surface to turn into metamorphic rocks?

• Cooling quickly

• Being eroded

• Heat and pressure

• Exposure to water

What happens to rocks that are not hot enough to melt but are under high pressure?

• They turn into sedimentary rocks

• They become igneous rocks

• They are cooked and smooshed into metamorphic rocks

• They remain unchanged

What are sedimentary rocks made from?

• Lava

• Bits of eroded rock, mineral grains, and plant and animal remains

• Molten magma

• Crystals

Why are the layers in sedimentary rocks important?

• They indicate the rock's age

• They show the rock's color

• They determine the rock's hardness

• They affect the rock's temperature

What can happen if sedimentary rock layers are disturbed?

• New rocks form

• The rock becomes igneous

• The rock melts

• Old rock pieces might be overturned and moved to the surface

Which type of rock can be transformed into a metamorphic rock?

• Only extrusive rocks

• Both igneous and sedimentary rocks

• Only sedimentary rocks

• Only igneous rocks