Geography

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Terms in this set (...)

The structure of the earth
First the earth was a giant sea of magma as it cooled the heavier material sank and the lighter material floated to the surface.
The three layers of the earth
Crust , mantle , core or mantle , crust , core or mantle , core ,crust
What causes plates to move
Plates move because the hot core heats the mantle.this causes convection currents in the mantle . The magma moves upwards for the core down to the crust here it cools and sinks and the cycle starts together
Convection currents
There is a friction between the convection currents and the plates as a result the plate may pull away or collide
The Andes
The worlds youngest fold mountains . Formed only about 30 - 35 million years ago .
They include the Andes , the Alps , Himalayas , Rockies
During this period of folding are called alpine fold mountains
Fold mountains Munster
The most recent fold mountains in Ireland were formed in muster about 250 million years ago when the EURASIAN PLATE AND THE AFRICAN PLATE collided.
Includes magillicuddy reeks , falters,comeraghs , knockmealdowns
This period was called the amorocan fold mountains .
Igneous rocks
Formed as a result of volcanic activity hot magma cooled down and solidifies either on the surface or within the crust
Sedimentary rock
Formed from the remains of plants animals or other rocks . The sediments were deposited and they were compressed together
Metamorphic rock
Are those that have been changed in shape or form by great heat or pressure
Igneous rocks
Granite and basalt
Sedimentary rock
Limestone and sandstone
Metamorphic rock
Marble and quartzite
Mechanical weathering
Mechanical weathering causes rocks to be broken into smaller pieces the most common type of mechanical weathering is FREEZ - THAW