Oceanic and Continental Crust Concepts

The video tutorial explains the differences between oceanic and continental crust. Oceanic crust is found beneath oceans, is thinner, and composed of denser rocks like basalt. Continental crust forms land masses, is thicker, and made of lighter rocks like granite. Oceanic crust is continuously formed at mid-ocean ridges, while continental crust forms through complex processes at subduction zones. Oceanic crust is younger due to recycling, whereas continental crust can be billions of years old. The density differences affect buoyancy, with continental crust floating higher, forming land, and oceanic crust forming ocean basins.

Where is oceanic crust primarily located?

• In the Earth's core

• Beneath the oceans

• Beneath the continents

• On mountain tops

What is the typical thickness range of continental crust?

• 5 to 10 km

• 10 to 20 km

• 20 to 70 km

• 70 to 100 km

Which type of rock is primarily found in oceanic crust?

• Granite

• Basalt

• Limestone

• Sandstone

What element is abundant in the rocks of continental crust?

• Iron

• Magnesium

• Nickel

• Silica

How is new oceanic crust formed?

• Through erosion

• By sediment accumulation

• At mid-ocean ridges

• Through volcanic eruptions

What geological feature is associated with the formation of continental crust?

• Mid-ocean ridges

• Volcanic islands

• Subduction zones

• Ocean trenches

What is the approximate maximum age of some parts of the continental crust?

• 200 million years

• 1 billion years

• 2 billion years

• 4 billion years

Why is oceanic crust generally younger than continental crust?

• It is more exposed to erosion

• It forms faster

• It is continuously recycled

• It is less dense

What is the density range of oceanic crust?

• 3.5 to 4.0 g/cm³

• 3.0 to 3.5 g/cm³

• 2.5 to 3.0 g/cm³

• 2.0 to 2.5 g/cm³

How does the density of continental crust affect its position on the mantle?

• It causes earthquakes

• It forms ocean basins

• It floats higher, forming land

• It sinks below oceanic crust