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1. What is the difference between a compositional layer and a
1. What is the difference between a compositional layer and a

... Convention is the movement of matter that results from differences in density caused by variations in temperatures. As rock in the lower mantle is super heated, it becomes less dense and rises up through the mantle. Once it reaches the upper portion of the mantle it forces the cooler, more dense roc ...
Evidence for Continental Drift
Evidence for Continental Drift

(1 point
(1 point

... this layer they ______________ _____, indicating the inner core is solid. g) At about ____________ , the inner core is the ____________________ part of Earth. h) The inner core, at the center of the Earth, also experiences the greatest amount of _____________________. i) The inner core makes up abou ...
The Big MELT
The Big MELT

... of the axis. Since there are also many more seaan excellent surrounding source of seismic waves, mounts on the western, or Pacific Plate, side of the since earthquakes frequently occur in these zones, axis, the asymmetry may be related to melting and where the seafloor created at the East Pacific Ri ...
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Recall Hypsometric Curve?

... – Includes crust and rigid upper mantle – This is the rigid plate in plate tectonics – Base is defined by 1200º 1200ºC boundary ...
Earth is made of hard rock
Earth is made of hard rock

... I’m sure you’re thinking (you! Yes, you! Don’t play the innocent!) that, like a goof number of your fellows, that Earth is an ocean of magma (so liquid) where some little ships are floating (so solid) which are tectonic plates. Sorry to tell you you’re totally wrong! As you already know (or don’t ;- ...
File
File

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Theory of Plate Tectonics III

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Earth Science Unit 2 Review Worksheet Name Block Circle the letter
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Inside Earth: Layers of the Earth
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... tremendous pressure it is under from all of the other layers pushing down above it and gravity pulling all of Earth’s mass towards the center. The outer core is liquid nickel and iron. It is also extremely hot and surrounds the inner core and has an average thickness of about 2250 kilometers. Scien ...
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Inner Core - Net Start Class

crust - River Dell Regional School District
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APS Science Curriculum Unit Planner

... Sonar is technology that uses sound waves to map the ocean floor. Magnetometers measure small magnetic changes in the ocean floor. The earth’s outer layer is broken into a series of large slabs of rock material called tectonic plates. These plates comprise the lithosphere, the outer most rigid layer ...
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motions.of.tectonic.plates.activiity - wikifuller

... a. subduction zones c. convection currents b. transform faults d. divergent boundaries 2. The crust and upper mantle make up Earth's _____. a. lithosphere c. shield b. asthenosphere d. continents 3. The boundaries between two colliding plates are called _____. a. divergent c. a transform fault b. co ...
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RHV_Margins_Mini_Lesson.v8

Plate Tectonics Definition
Plate Tectonics Definition

... The volcanism stems from the unique manner at which subduction produces molten rock. Some of the ocean water trapped in the oceanic crust is brought down into the asthenosphere with it. Because of the higher temperature, the water evaporates from the oceanic crust and dissolves into the wedge of as ...
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Mantle plume



A mantle plume is a mechanism proposed in 1971 to explain volcanic regions of the earth that were not thought to be explicable by the then-new theory of plate tectonics. Some such volcanic regions lie far from tectonic plate boundaries, for example, Hawaii. Others represent unusually large-volume volcanism, whether on plate boundaries, e.g. Iceland, or basalt floods such as the Deccan or Siberian traps.A mantle plume is posited to exist where hot rock nucleates at the core-mantle boundary and rises through the Earth's mantle becoming a diapir in the Earth's crust. The currently active volcanic centers are known as ""hot spots"". In particular, the concept that mantle plumes are fixed relative to one another, and anchored at the core-mantle boundary, was thought to provide a natural explanation for the time-progressive chains of older volcanoes seen extending out from some such hot spots, such as the Hawaiian–Emperor seamount chain.The hypothesis of mantle plumes from depth is not universally accepted as explaining all such volcanism. It has required progressive hypothesis-elaboration leading to variant propositions such as mini-plumes and pulsing plumes. Another hypothesis for unusual volcanic regions is the ""Plate model"". This proposes shallower, passive leakage of magma from the mantle onto the Earth's surface where extension of the lithosphere permits it, attributing most volcanism to plate tectonic processes, with volcanoes far from plate boundaries resulting from intraplate extension.
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