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physcial geography

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Crust   Is the outer layer of the earth, consists of oceanic and continental crust.  
Core   Is the inner layer of the earth, consists of iron and nickel.  
Mantle   Makes up over 75% of earths volume, consists of several layers of rock(just under the crust).  
Sial   Is the material the continental crust is made out of because it consists silica and aluminium.  
Sima   Is the material the oceanic crust is made out of because it consist of silica and magnesium.  
Lithosphere   Is the name given to the crust and the upper part of the mantle.  
Asthenosphere   is the region just below the lithosphere.  
Plates   Are the large ridged sections that the lithosphere is divided up into.  
Continental fit   Is the coasts of the continents surrounding the Atlantic ocean could fit together like a jigsaw puzzle, if the continents were moved closer.  
Convection Currents   Are in the mantle and are the main cause of plate movement.  
Divergent Boundary   Is when plates separate and move apart from one another since new rock is formed, these are constructive boundaries.  
Convergent boundary   Is when plates collide with one another since rock is destroyed, these are destructive boundaries.  
Transform Boundary   Is when plates grind past one another since rock is neither formed or destroyed, these are passive boundaries.  
Subduction   When one plate sinks below the other.  
Fault line   Is the line along which the plates slide  
Active volcano   Are volcanoes that are currently erupting or showing signs of unrest E.g. Mount Ethna.  
Dormant volcano   Are volcanoes that haven't erupted in at least 600 years and are now quiet but have a high probability that they'll erupt again E.g. Mount St Helens.  
Extinct volcano   Are volcanoes that haven't erupted in historical time E.g. Slemish Mountain in Antrim  
vent   The passage that goes up through a volcanic cone to allow lava to erupt on the surface.  
Crater   Is a steep-sided depression found at the top of the volcano.  
Pyroclastic cloud   Is a cloud consisting of volcanic ash.  
Basic lava   Is the lava that has less silica, causes it to be runny.  
Acidic lava   Is the lava that has more silica, causes it to be not as runny.  
Lahar   Is when ash and dust gets mixed up with rain or melted snow, a wet debris flow, a lahar can flow down slopes at speeds up to 200kmph  
Intrusive   Is when the magma cools deep underground and forms intrusive landforms.  
Extrustive   Is when the magma makes its way to the surface of the earth and cools.  
Hot spot   Hot mantle under the plate known as a hot spot.  
Fissure   Large fractures in the earths crust.  
Laccoliths   Are dome-like structures with a flat floor.  
Sills   Are horizontal sheets of volcanic rock that run parallel to the rock strata.  
Dyke   Are thin vertical sheets of volcanic rock that run perpendicular to the rock strata.  
Batholith   large platons at the surface and are greater then 100km.  


   






 
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Created by: kerri15