Term
| What interrelationships do plate tectonics explain? |
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Definition
| volcanoes, earthquakes, climate, mountains and even evolution |
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Term
| what was basically proven (geologically) with the 1860's lying of the transatlantic telegraph cable? |
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Definition
| that there is a mountain range in the middle of the atlantic ocean. |
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Term
| Alfred Wegener was famous for proposing which scientific theory? |
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Definition
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Term
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Definition
| the last ancient super continent that included all of today's major continental land masses. |
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Term
| Which two widely-seperated mountain ranges formed a single range, millions of years ago? |
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Definition
| Appalachians,European caledonian mountains |
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Term
| which geologic feature suggest that there was a continental glacier in souther pangaea? |
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Definition
| we had glacial striations |
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Term
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Definition
| similar plant and animal species that are seperated by a water but on islands next to landmass are similar but if fart away they are different. |
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Term
| Why was the Theory of Continental Drift rejected? |
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Definition
| there was no acceptable method to move the continents |
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Term
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Definition
| a solid, strong and somewhat rigid outer layer that includes the both oceanic rocks and the continental rocks with a thin layer of mantle rock material. this is frozen onto both of the upper visible crusts |
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Term
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Definition
| a plastic-like zone of partially-melted upper mantle rocks. |
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Term
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Definition
| the rocky zone between the asthenosphere and the liquid outer iron core. |
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Term
| Describe the transfer of Earth's internal heat. what is it mostly generated from? |
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Definition
| it is transferred from the core, through the mantle, to the asthenosphere; radioactive decay |
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Term
| What are the two components when dealing with the core. |
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Definition
| liquid outer iron core, solid iron core |
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Term
| what is liquid outer iron core? |
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Definition
| a mass of liquid iron with minor amounts of other metals and rocks |
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Term
| what is the solid iron core? |
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Definition
| there are lots of theories as to the exact chemical composition of Earth's solid iron core. |
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Term
| How thick is the solid iron core? |
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Definition
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Term
| What effect does earth's magnetic shield have on our planet's life? |
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Definition
| if we did not have, we would dissappear within a year ( die ) |
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Term
| What "poles" does earth's magnetic field create? |
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Definition
| Magnetic North pole, Magnetic South pole |
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Term
| what visible evidence (in the sky) is there for Earth's magnetic shield? |
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Definition
| The northern lights; Aurora Borealis |
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Term
| Describe what happens to a magnetite grain when it cools within a basaltic magma. |
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Definition
| They can allign themselves with the north and south magnetic poles. |
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Term
| Define Paleomagnetism and why is it an important geologic tool? |
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Definition
| the study of ancient magnetic fields, gave supporting evidence that the continents have moved over time. |
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Term
| What is a magnetic reversal and when may it occur again? |
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Definition
| a 180 reversal of the polarity of EArth's magnetic fields( north becomes south) ; any time |
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Term
| What is the name and depth of the deepest submarine trench? |
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Definition
| Marina Trench, 38,000 feet (7 miles) |
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Term
| What theory did H.H. Hess propose in 1960? |
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Definition
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Term
| According to Dr. Hess, how often would all of the ocean crust be regenerated? |
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Definition
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Term
| Why is it that we no longer use the term "continental drift"? |
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Definition
| because all the continents are attached to lithosphere plates which is composed of both oceanic crust; continental crust |
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Term
| Name a famous American rift zone developed under a Texas bordering river. |
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Definition
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Term
| What are the three types of convergent plate boundaries? |
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Definition
| OCEANIC CRUST being subducted beneath OCEANIC CRUST; OCEANIC CRUST being subducted beneath CONTINENTAL CRUST; when both plates composed of CONTINENTAL CRUST collide |
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Term
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Definition
| chains of volcanic islands found on top of the ocean plate that is not being subducted at the convergent zone. |
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Term
| What is an accreted terrain? |
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Definition
| seafloor, island arcs and ocean sediment that is "scraped off" onto a continent as the oceanic crust is being subducted into the mantle. |
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Term
| what happens when two continental plates collide? |
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Definition
| one plate or crust must override another; oceaqnic crust must always go under |
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Term
| Name at least two famous mountain ranges caused by two continental plates colliding |
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Definition
| Appalachian and Himalayn mountains |
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Term
| What is the basic premise of the Passive Plate theory? |
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Definition
| the convection of heat from the core and mantle drives plate movement |
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Term
| What is the basic premise of the Slab Pull theory? |
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Definition
| Oceanic slabs sink into the mantle under its own weight (density) |
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Term
| what is meant by the super-continent cycle? |
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Definition
| that approximately every 500 million years, most of earth's plates collide together to form a massive continent. |
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