Exploring Earth's Crust: Oceanic and Continental Layers Explained

The video introduces the Earth's crust, focusing on oceanic and continental types. Oceanic crust, found under oceans, is dense and continuously formed at divergent boundaries. Continental crust, beneath land masses, is thicker and less dense, composed of rocks like granite. The video also explains subduction zones, where denser oceanic crust slips under continental crust.

What does the term 'crust' refer to in the context of Earth's layers?

• The innermost layer of the Earth

• The outermost layer of the Earth

• The layer between the mantle and the core

• The layer that forms the Earth's atmosphere

Which type of rock is primarily found in the oceanic crust?

• Gneiss

• Schist

• Granite

• Basalt

How thick is the oceanic crust on average?

• 30-50 km

• 8 km

• 100 km

• 15 km

What is a unique feature of the oceanic crust?

• It is not involved in plate tectonics

• It is made of less dense rock

• It is still being formed today

• It is thicker than the continental crust

What is the primary composition of the continental crust?

• Metallic elements

• Less dense rock like granite

• Dense rock like basalt

• Volcanic ash

What does the term 'plutonic' refer to in geology?

• Rocks formed from sedimentary processes

• Rocks formed deep under the Earth's surface

• Rocks formed from volcanic eruptions

• Rocks formed in the ocean

What occurs at subduction zones?

• Oceanic crust forms new landmasses

• Two continental plates collide

• Oceanic crust slips beneath continental crust

• Continental crust moves over oceanic crust