Hazards 4 AQA A Level Geography

What happens at a destructive plate margin?

• Crust is neither produced nor destroyed as the plates slide horizontally past each other

• New crust is generated as the plates pull away from each other

• Crust is destroyed as one plate subducts under another

What happens at a conservative plate margin?

• Crust is destroyed as one plate subducts under another

• Crust is neither produced nor destroyed as the plates slide horizontally past each other

• New crust is generated as the plates pull away from each other

What happens at a constructive plate margin?

• New crust is generated as the plates pull away from each other

• Crust is neither produced nor destroyed as the plates slide horizontally past each other

• Crust is destroyed as one plate subducts under another

What is ‘ridge push’?

• Gravitational force that causes a plate to move away from the crest of an ocean ridge, and into a subduction zone

• As a crustal plate moves further from an oceanic ridge, it cools and becomes increasingly dense. This causes it to sink beneath the continental crust in a subduction zone. The weight of this sinking, cooling plate causes a major pulling action, which causes the rest of the plate to be pulled downwards as well.

• It is a scientific theory describing the large-scale motion of Earth's lithosphere. The theoretical model builds on the concept of continental drift developed during the first few decades of the 20th century

• Heat from the Earth’s core causes currents in the mantle. These currents slowly move the crust around. In some places the crust is destroyed. In other places new crust is formed.

What is ‘slab pull’?

• Gravitational force that causes a plate to move away from the crest of an ocean ridge, and into a subduction zone.

• It is a scientific theory describing the large-scale motion of Earth's lithosphere. The theoretical model builds on the concept of continental drift developed during the first few decades of the 20th century

• As a crustal plate moves further from an oceanic ridge, it cools and becomes increasingly dense. This causes it to sink beneath the continental crust in a subduction zone. The weight of this sinking, cooling plate causes a major pulling action, which causes the rest of the plate to be pulled downwards as well.(

• Heat from the Earth’s core causes currents in the mantle. These currents slowly move the crust around. In some places the crust is destroyed. In other places new crust is formed.

What is ‘plate tectonic theory’?

• Gravitational force that causes a plate to move away from the crest of an ocean ridge, and into a subduction zone.

• As a crustal plate moves further from an oceanic ridge, it cools and becomes increasingly dense. This causes it to sink beneath the continental crust in a subduction zone. The weight of this sinking, cooling plate causes a major pulling action, which causes the rest of the plate to be pulled downwards as well.

• It is a scientific theory describing the large-scale motion of Earth's lithosphere. The theoretical model builds on the concept of continental drift developed during the first few decades of the 20th century.

• Heat from the Earth’s core causes currents in the mantle. These currents slowly move the crust around. In some places the crust is destroyed. In other places new crust is formed.

What are ‘convection currents’?

• Gravitational force that causes a plate to move away from the crest of an ocean ridge, and into a subduction zone.

• As a crustal plate moves further from an oceanic ridge, it cools and becomes increasingly dense. This causes it to sink beneath the continental crust in a subduction zone. The weight of this sinking, cooling plate causes a major pulling action, which causes the rest of the plate to be pulled downwards as well.

• It is a scientific theory describing the large-scale motion of Earth's lithosphere. The theoretical model builds on the concept of continental drift developed during the first few decades of the 20th century.

• Heat from the Earth’s core causes currents in the mantle. These currents slowly move the crust around. In some places the crust is destroyed. In other places new crust is formed.

Which type of lava is the most viscous?

• Alkaline

• Basaltic

• Andesitic

• Rhyolitic

Identify the landform

• Island arc

• Ocean ridge

• Rift valley

• Young fold mountains

Identify the landform

• Island arc

• Ocean ridge

• Rift valley

• Young fold mountains