Constructive Plate Boundaries Concepts

The video tutorial explains the process of oceanic plate boundaries where two pieces of oceanic crust move apart due to convection currents in the mantle. This movement creates a gap through which magma rises, forming new rock and eventually volcanic islands. The boundary is termed 'constructive' as it builds new land. Frequent volcanic eruptions and minor earthquakes are common at these boundaries, with examples like Iceland and Surtsey illustrating the process.

What causes the movement of oceanic crust in a constructive plate boundary?

• Wind currents

• Convection currents in the mantle

• Tidal forces

• Magnetic fields

In a constructive plate boundary, how do the oceanic plates move?

• Vertically

• Away from each other

• Towards each other

• In a circular motion

What happens when magma rises through the gap between separating plates?

• It forms a trench

• It solidifies into new rock

• It evaporates

• It causes a tsunami

What is the result of continuous eruptions at a constructive plate boundary?

• Formation of deserts

• Formation of mountains

• Creation of volcanic islands

• Destruction of land

Why is a constructive plate boundary called 'constructive'?

• Because it forms trenches

• Because it creates new land

• Because it destroys land

• Because it causes earthquakes

What type of volcanic activity is common at constructive plate boundaries?

• Eruptions with thick lava

• No volcanic activity

• Frequent eruptions with runny lava

• Explosive eruptions

What is the primary geological feature formed by constructive plate boundaries?

• Mountain ranges

• Deep ocean trenches

• Deserts

• Volcanic islands

Which of the following is a real-world example of land formed by constructive plate boundaries?

• Iceland

• The Andes

• The Sahara Desert

• The Himalayas

What is the nature of earthquakes at constructive plate boundaries?

• Frequent and major

• Non-existent

• Major and destructive

• Minor and less frequent

What is the role of convection currents in the formation of new land at constructive plate boundaries?

• They push the plates together

• They cause the plates to sink

• They cool the magma

• They pull the plates apart