Geography: Tectonics Flashcards
(19 cards)
Earthquake
The violent shaking of the Earth’s crust.
Earthquake magnitude
The strength of an earthquake.
Earthquake intensity
The violence of Earth movements caused by an earthquake.
Mercalli scale
Scale used to measure earthquake intensity.
Richter Scale
Scale used to measure earthquake magnitude.
Focus
The point at which the pressure is released inside the Earth.
Epicentre
The point on the ground surface immediately above the focus.
Social impacts
Direct impact on people.
Environmental impacts
Impact on the landscape.
Economic impacts
Impact on economic activities.
Secondary cones
Eruptions from other vents may build up secondary cones on the flanks.
Volcanic Bombs
Larger material being thrown out by the force of the eruption.
Crust
The outer layer of the earth.
Continental Crust
Thicker, older, less dense, made of granite. (one type of crust)
Vent
Central tube which magma flows through.
Crater
Bowl-shaped basin on the top of a volcano.
Lava
Magma, once it reaches the surface of the volcano.
Magma chamber
Large underground pool of magma.
Oceanic Crust
Thinner, newer, more dense, made of basalt. (one type of crust)
