The Earth Geography

Term Definition
Inner Core This layer of the earth is solid due to pressure.
Outer Core This layer of the earth is made up of nickel and iron.
Pangaea Over 200 million years ago, this was the name given to the one large continent that existed.
The Theory of Continental Drift Alfred Wegener came up with this theory.
Focus This is the origin of an earthquake.
Tremor This is the tidal wave created by an earthquake.
Convection Currents Magma moves around the mantle in these motions.
Conservative The name given to the plate boundary where plates slide past each other.
Fissure This is a crack in the earth's crust where magma can gently escape.
Pacific Ring of Fire This is the most active earthquake and volcanic zone in the world.
Dormant Volcano This type of volcano has not erupted for some time but could erupt again.
Slemish Mountain, Co. Antrim This is an example of an extinct volcano.
Crater Magma erupts through this opening.
Fertile The type of soil that is left after a volcano has erupted.
Mudflow This is what occurs when snow and ice are mixed with ash during a volcano.
Mid-Ocean Ridge This is a mountain range that can form under the ocean.
Hekla This is an active volcano found in Iceland.
Geyser Hot springs are also known as this.
Seismograph This is the instrument used to measure and record earthquakes.
Philippines An earthquake occurred in this country on the 15th October 2013 that measured 7.2 on the Richter Scale.
Syncline This is the downward fold in a fold mountain.
Armorican These type of fold mountains were formed about 250 million years ago.

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