Term
| What are the two types of crest |
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Definition
| Oceanic and Continental Crust |
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Term
| The lithosphere is comprised of which layer or layers |
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Definition
| oceanic crest and contninetal crest and upper mantle. |
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Term
| What are the three zones into which the manlte can be divided |
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Definition
| Upper Mantle,Ashthenosphere,lowerMantle |
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Term
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Definition
| the plates are compress of the relatively rigid outer shell of earth |
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Term
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Definition
| the forces that generated inside the earth |
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Term
| What is the the theory of plate tectonics |
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Definition
| plates thectonics theory hold that the earth lithosphere is divided into rigid plates that move over the asthenosphere and diverge ,converge and/or slide past each other as they move. |
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Term
| What are the 3 types of plate boungaries and how they take place |
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Definition
divergent boundary - involes two plates that are moving apart from each other.
convergent boundary - plates move towards each other.
transform boundary - plates slide past one another. |
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Term
| What are three types of covergent boundaries |
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Definition
| Ocean-continent, Ocean-ocean, Continent-Continent |
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Term
Why are convergent plate boundiers strongly associatal with geological disaster |
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Definition
| because it cause a ocean trenches wich cause earthquakes and volcano. |
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Term
| What happens when two continents coverge |
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Definition
| one goes under and creates mountain range at where the colligen take place |
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Term
| What happens at oceanic - continental convergent plate boundery |
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Definition
| in the region where the top of the subducting plate slide beneath the an asthenosphere. Melting takes place and magme is created |
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Term
| describe the different between continental crust and oceanic crust |
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Definition
| Continental crest is thicker then oceanic crest. |
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Term
| What is the Ashenosphere why is it important |
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Definition
- A redion of the earth outer shell beneath the lithosphere.
- It may represent a zone where magma is likely to be generated.
- The rocks here may have ralatively little strengh and therefore are likely to fow.
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Term
| How does the lithopshere differ from the aesthenosphere |
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Definition
- Lithosphere is solid and is made up of the crest and upper mantle.
- Asthenosphere in under the lithosphere and it isnt soild or liquid chute of the tempeture and pressure.
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Term
| What is the mohorovicic discontinuity |
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Definition
| it is the boundary that separates the crest from the mantle seneath it |
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Term
| Describe seismis-wave shadow zones and what they indicate about the earth's interior |
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Definition
- It indicates that s-waves do not travel through the core at all.
- It implies that the core of the earth is a liquid or at least acts like liquid.
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Term
| Describe the ULVZ zone at the core-mantle boundary |
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Definition
| may be due to hot core partially melting overlying mantle rock or to part of the liquid outer core reacting chemically with the adjacent mantle. |
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Term
| explain how the earth's spinning inner core plays an impoetant role in the generation of the earth magnetie field. |
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Definition
| because the magnetic lines of force panetrate and connet both the inner and outer core a faster rate of rotation of the inner core would play an important role in the genertion of the earth magnetic field. |
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Term
| What is geothermal gradient |
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Definition
| temperature increase with deoht into earth. |
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Term
| What evidence have shown that the mantle is solid not molten and that geothermal gradient is as low as 1c per kilometer and not 25c per kilometer within the mantle. |
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Definition
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Term
| What is earth magnetic field ? What ia a magnetic reversal |
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Definition
- Region of magnetic force the surrounds the earth.
- a change in the polarity of the magnetic field.
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Term
| explain how magnetic anomalies are applied to stuy in geologic structures and ore detections. |
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Definition
| A body of magnetile ore (a highly magnetic ore of the matal iron) has been emplaced in a limestone by hot solutions rising along a fracture. The magnetism of the iron ore adds to the magnetic field of the earth a strong magnetic field at the surface |
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Term
| What are positive and negative magnetic anomalies |
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Definition
- positive - reading of magnetic field strength that is higher the regional average
- negative - a reading of magnetic field strength that is lower than the reginal average.
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Term
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Definition
| is the balance or equilibrium of adjacent blocks of brittle lithopshere " floating on the asthenosphere. |
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Term
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Definition
| concept of vertical movement of section of the earth's crest to achieve balance or equilibrium. |
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Term
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Definition
| The rise of the crusted liosphere after the removal of the ice |
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