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answer key
answer key

... The theory that the surface of the earth is made up of several giant lithospheric plates that are in constant motion. The plates are moving because of convection currents in the mantle beneath the plates. ...
Plate Tectonics - DuBois Area School District
Plate Tectonics - DuBois Area School District

... Mid-oceanic ridges have a greater elevation than the surrounding seafloor. Because the midocean ridges are higher, gravity pulls the surrounding rock down and away from the ridge. The rising mantle material at the midocean ridge creates the potential for the plates to move away from the ridge with a ...
What happens at tectonic plate boundaries?
What happens at tectonic plate boundaries?

... Ocean-Ocean Plate Collision  When two oceanic plates collide, one runs over the other which causes it to sink into the mantle forming a subduction zone.  The subducting plate is bent downward to form a very deep depression in the ocean floor called a trench.  The worlds deepest parts of the ocea ...
Unit 11: Plate Tectonics
Unit 11: Plate Tectonics

... 2. Oceanic ridge – seafloor that is elevated along well developed divergent boundaries 3. Rift valleys – deep faulted structures found along the axes of some segments 4. Seafloor spreading – The process in which the ocean floor is extended when two plates move apart, forming a crack where magma can ...
No Slide Title
No Slide Title

... Age of seafloor –Oceanic igneous rock is much younger than continental igrox –Oceanic rock gets younger as you approach the mid-ocean ridge (mountain range which runs through all world’s oceans) ...
File
File

... Plates of lithosphere move because of convection currents in the asthenosphere. 13. Name and describe the three types of plate boundaries. Divergent boundaries—where two plates move apart from one another. Convergent boundaries—where two plates move toward one another. Transform fault boundaries— wh ...
1 Mountains and Mountain Ranges
1 Mountains and Mountain Ranges

... • 190 mya (Jurassic) South America moves west • By 140 mya, Pacific plate had subducted to accommodate motion • By 130 mya, descending plate creates lots of basaltic magma ...
draw a diagram of earth`s interior and label each
draw a diagram of earth`s interior and label each

... WHAT IS THE PROCESS CALLED THAT DRIVES THE MOVEMENT OF LITHOSPHERIC PLATES AND WHERE DOES THIS OCCUR? DRAW A DIAGRAM DESCRIBING HOW THIS PROCESS WORKS CONVECTION OCCURS IN THE MANTLE WHEN COOL DENSE MATERIAL SINKS TO THE BOTTOM OF THE MANTLE NEAR THE CORE AND WARM LESS DENSE MATERIAL RISES TO THE T ...
Structural Geology, Tectonics and Regional Geology
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Earth Science Vocabulary
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Chapter 7 Review - Plate Tectonics
Chapter 7 Review - Plate Tectonics

... and you must know for your test. In addition to completing this review, you should look over your notes, worksheets, the book, and any other material given. EVERYTHING we discussed and learned about should be studied. 1. Use the circle below to create a model of Earth’s interior. Label and color eac ...
Plate Tectonics Key Concepts List
Plate Tectonics Key Concepts List

...  A boundary where two plates collide………………………………………convergent  A boundary where two plates move away from each other…………………divergent  The part of the mantle that can bend like plastic……………………….asthenosphere  The process that continually adds new material to the ocean floor…………sea-floor spreadin ...
Plate Tectonics Review Worksheet
Plate Tectonics Review Worksheet

... plates move. What is the Mesosphere – the strong lower part of the mantle between the asthenosphere and the outer core. 7. What causes the plates to move? Convection currents in the mantle 8. What is the difference between oceanic crust and continental crust? Oceanic crust is denser, younger, and th ...
Plate Tectonics and Continental Accretion
Plate Tectonics and Continental Accretion

... marks left behind after the collision of an automobile with a cement wall. The paint smear and skid marks left by the colliding vehicle can be used by detectives in their investigation of the collision. The upper layers of the downgoing oceanic slab are, in descending order: terrigenous (continental ...
PLATE TECTONICS AND SEA-FLOOR SPREADING REVIEW
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... CREATING MOUNTAINS (EX: HIMALAYAS CREATED BY INDIA COLLING WITH ASIA) 9. ___SUBDUCTION___ occurs when old oceanic crust is forced back into the mantle. 10. Where is new oceanic crust being formed? __AT MID OCEAN RIDGES (SEA- FLOOR SPREADING)_____ ...
Plate Tectonics Power Point
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... 2. What is a tectonic plate? 3. What powers the movement of the tectonic plates? Tell where this force is and how it works? 4. What are seismic waves? 5. Why do seismic waves travel at different speeds in the lithosphere, Asthenosphere, mantle outer core and inner core? 6. What is the theory of cont ...
Stop the Continent, I Want to Get Off! - PLC-METS
Stop the Continent, I Want to Get Off! - PLC-METS

... • Melting decreases the density, so it rises, forming a row of volcanic mountains parallel to the convergent boundary, therefore parallel to the continental coast. • This chain of volcanoes is known as a “Volcanic Arc”. ...
Types of plate boundaries
Types of plate boundaries

... • Deep-Ocean Trenches • Like deep canyons that form in the ocean floor as a plate sinks • Most are found in the Pacific Ocean • The Mariana Trench is where the Pacific Plate is sinking under the ...
Testing Plate Tectonics & Mechanisms of Plate Motion
Testing Plate Tectonics & Mechanisms of Plate Motion

... deep-sea drilling into the sediments on the ocean floor  The data on the ages of seafloor sediment confirmed what the seafloor spreading hypothesis predicted  The youngest oceanic crust is at the ridge crest and the oldest oceanic crust is at the continental margins  No sediment older than 180 mi ...
Plate Tec Review Sheet 2016 Answers
Plate Tec Review Sheet 2016 Answers

... CREATING MOUNTAINS (EX: HIMALAYAS CREATED BY INDIA COLLING WITH ASIA) 9. ___SUBDUCTION___ occurs when old oceanic crust is forced back into the mantle. 10. Where is new oceanic crust being formed? __AT MID OCEAN RIDGES (SEA- FLOOR SPREADING)_____ ...
Plate Tectonics
Plate Tectonics

... floor is called sea-floor spreading. ...
Plates are large rigid slabs on Earth`s surface. Interact at boundaries
Plates are large rigid slabs on Earth`s surface. Interact at boundaries

... spreading, this occurs at the center of the oceanic ridge system: the largest mountain range in the  world.  Plates grow where this sea floor spreading occurs.  Plates can grow if other areas have plates shrinking.  This occurs at subduction zones, where there are  convergent boundaries, characteriz ...
Plate Tectonics
Plate Tectonics

... coming to the ...
Plate Tectonics
Plate Tectonics

... • No subduction • Continental plates light, resist downward motion • Rocks buckle and fold and are “welded” together • Mountain range formed • What example is in this picture? • The Himalayas ...
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Oceanic trench



The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor. Oceanic trenches are a distinctive morphological feature of convergent plate boundaries, along which lithospheric plates move towards each other at rates that vary from a few mm to over ten cm per year. A trench marks the position at which the flexed, subducting slab begins to descend beneath another lithospheric slab. Trenches are generally parallel to a volcanic island arc, and about 200 km (120 mi) from a volcanic arc. Oceanic trenches typically extend 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor. The greatest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km2/yr.
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