Oceanic crust

The video explains the characteristics of oceanic crust, highlighting its density and composition, which includes a high proportion of iron and magnesium. It also covers the process of oceanic crust formation at mid-ocean ridges and its destruction in subduction zones, emphasizing its dynamic nature.

What makes the oceanic crust denser than the continental crust?

• It is made of lighter materials.

• It contains more water.

• It is thicker than the continental crust.

• It has a higher proportion of iron and magnesium.

Which elements are found in high proportions in the oceanic crust?

• Calcium and potassium

• Iron and magnesium

• Silicon and oxygen

• Carbon and nitrogen

How thick is the oceanic crust typically?

• 1 to 3 kilometers

• 5 to 10 kilometers

• 15 to 20 kilometers

• 20 to 25 kilometers

Where is the oceanic crust constantly being formed?

• In the deep ocean trenches

• In the continental crust

• At mid-ocean ridges

• At subduction zones

What happens to the oceanic crust at subduction zones?

• It becomes continental crust.

• It is destroyed.

• It remains unchanged.

• It is formed.