Plate boundaries Flashcards
(14 cards)
What happens to the oceanic plate at a destructive plate boundary?
It is subducted into the mantle, creating an ocean trench
The oceanic plate is denser than the continental plate.
What geological events occur as the oceanic plate is subducted?
Earthquakes and volcanic eruptions
The crust jolts and grinds down, leading to these events.
What forms as the magma rises through cracks in the crust at a destructive plate boundary?
Composite volcanoes
Eruptions from these volcanoes are often violent with lots of gas.
What geological feature forms as the continental crust crumples at destructive plate boundaries?
Fold mountains
This occurs due to the collision and crumpling of the continental crust.
What are the primary hazards associated with destructive plate boundaries?
Earthquakes and volcanoes
How do plates behave at a conservative plate boundary?
They move past each other or are side by side, moving at different speeds
This movement can lead to friction and pressure build-up.
What occurs when pressure is released at a conservative plate boundary?
It sends out huge amounts of energy, causing an earthquake
Why are there no volcanoes at a conservative plate boundary?
No plates are being destroyed
This is in contrast to destructive and constructive boundaries.
What hazards are associated with conservative plate boundaries?
Earthquakes
What causes the plates to pull apart at a constructive plate boundary?
Convection currents in the mantle
These currents create tension in the crust.
What geological event can occur due to tension in the crust at a constructive plate boundary?
Earthquake
What forms when magma rises through cracks between plates at a constructive plate boundary?
Shield volcanoes
These volcanoes are characterized by their broad, gently sloping sides.
What happens to magma as it cools at a constructive plate boundary?
New oceanic crust is formed
What hazards are associated with constructive plate boundaries?
Earthquakes
