Science Quiz / Igneous 2

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Can you name the Dynamic Interior 1 Key Words?

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Crust & Mantle
Makes up most of the mantle (rock) 
Mark changes in mineralogy and chemical composition through the earth 
Separates the crust from the mantle 
Rebound of seismic waves at changes in mineralogy or composition 
Average age of continental crust 
Oldest oceanic crust 
Classification of the way in which a rock deforms 
Layer of elastic deformation (crust and some mantle) 
Layer of plastic deformation (rest of upper mantle) 
Layer of the lower mantle 
Equilibrium between sections of crust 
Rising of the land after melting of a glacier or ice cap 
Viscosity of the mantle is approx 10^(x)Pas 
Plate Tectonics
The generation of a magnetic field by the earth is referred to as the... 
The angle of the magnetic field with the earth's surface 
The direction of the magnetism 
Measuring orientation of magnetic minerals to determine magnetic field at depositional time 
Tectonic plates deform (x)-ally 
Mid-Ocean Ridges
Ocean ridges where plates are created are (x) boundaries 
Large flat regions of sea floor either side of a ridge 
Major central valley at the ridge crest 
Disruptions along length, usually normal to ridge axis 
Deep sea volcanic chimneys 
Switching of north-south poles creates (x) as seen with a magnetometer 
The generation of new crust as ridges pull apart causes (x) 
Large scale (answer to Mid-Ocean Ridges q4) 
Phase Equilibria
The temperature above which the system is entirely liquid 
The temperature below which the system is entirely solid 
Meeting point of these lines 
Left behind after minerals are selectively dissolved 
Description of the weak ductile layer of the mantle in terms of seismic velocity 
Cooling due to expansion 
Melting due to pressure changes as material gets nearer the surface 
Most magmas are (x), carbonatites are rare 
Igneous rocks rich in Fe, Ca, and Mg 
Igneous rocks rich in alkalis 
Escape of dissolved volatiles when pressure is reduced 
Large crystal surrounded by groundmass 
Process of melt forming a nucleus for a crystal 
Second stage of forming a crystal 
When cooling rates are too high to form a nucleus (x) is formed 
Where an intrusion has contacted the cold country rock 
Large crystals produced by water-rich melt 
Movement of melt by percolating in channels between crystals 
Movement of melt through brittle failures in rock 
Small scale intrusions that cool rapidly (dykes or sills) 
Cracks formed by contraction when cooling 
Partially melted rock detaching and pushing overlying rock away 
Deep seated intrusions 

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