Restless Earth Keywords Flashcards
Define Caldera
A large ridge forming the edge of a super volcano, where the original cone has either collapsed or been destroyed in a large eruption.
What is a conservative plate margin?
A plate margin where the tectonic plates are sliding past each other
What is a constructive plate margin?
A plate margin where the tectonic plates are moving apart
Define convection currents
Circulating movements of the magma in the mantle caused by the heat of the core.
What is a destructive plate margin?
A plate margin where the tectonic plates collide.
What is the epicentre?
It is the point on the ground directly above the focus (centre) of an earthquake.
Focus
The point of origin of an earthquake.
Magnitude
The size of an earthquake.
Oceanic Crust
The part of the earths crust which is below the oceans
Ocean trench
A deep depression on the ocean floor formed at subduction zones of destructive plate margins.
Plates
The large pieces of broken crust that cover the earth.
Plate margin
Boundary between two tectonic plates.
Prediction
Forecasting future changes
Primary effects
Impacts of natural disaster that happen immediately or soon after the event.
Response
The way in which people react to a situation e.g. an earthquake.
Secondary effects
The after effects of a disaster e.g. disease spreads due to dirty water, loss of economy due to destruction of businesses.
Subduction
The transformation into magma of a denser tectonic plate as it dives under a less dense plate.
Super volcano
A volcano capable of erupting on a much larger scale than a normal volcano.
Tectonic hazards
Threats posed by earthquakes, volcanoes etc.
Tsunami
Huge waves caused by earthquakes under the sea.
