Plate Tectonics: Earth’s Surface Is Dramatically Reshaping .

1y ago
446.01 KB
5 Pages
Last View : 6d ago
Last Download : 3m ago
Upload by : Kamden Hassan

Plate Tectonic MovementsName: Period: Date:EQ: How is Earth’s crust changed by plate movements?Plate Tectonics: Welcome to the greatest show on Earth. Propelled by intense heat simmering beneath the crust or themantle, Earth’s surface is dramatically reshaping itself in an endless, slow-motion movement called plate tectonics.Tectonic plates or huge slabs of solid rocks separate, collide, and slide past each other causing earthquakes, feedingvolcanic eruptions, and raising mountains. Scientists now have a fairly good understanding of how the plates move andhow such movements relate to earthquake activity. Most movement occurs along narrow zones between plates, plateboundaries, where the results of plate-tectonic forces are most evident.Types of plate boundaries:1.2.3.Divergent boundaries -- where new crust is generated as the platespull away or separates from each other.Examples: mid ocean ridge, rift valleysConvergent boundaries -- where crust come together. One crust isdestroyed as it dives under another, known as subduction.Examples: subduction, Marianas trench, mountains, volcanoesTransform boundaries -- where crust is neither produced nordestroyed as the plates slide horizontally past each other. Example:San Andreas faultPlates Move Apart: Divergent BoundaryAtlantic ocean, along a global system of mountain ridges, Earth’splates are growing and spreading apart. Each year these oceanicspreading ridges erupt more than three times as much molten rock asdo all the volcanoes on land. Magma rises from Earth’s mantle atspreading ridges and cools on and beneath the ocean floor, adding tothe plates on either side. The growing plates inch away from theridges—widening ocean basins and rafting apart entire continents.Plates Come Together: Convergent BoundaryWhere plates come together, or converge, we see some dramatic manifestations ofplate tectonics. At convergent margins, continents grow as plates are consumed.Three types of Convergent Boundaries1. Convergent boundary between continental and oceanic crust results tosubduction, volcanoes, and trenches.2. Convergent boundary between two oceanic crust results to subduction, and thetrenches formed are deeper like the Marianas Trench, which can sink Mt. Everest.3. Convergent boundary between two continental crust results to building up therocks forming mountains like the Appalachian and Himalayas mountain ranges.

Plates Pass By: Transform BoundaryWhy do earthquakes shake California? Thestate straddles two plates that are moving pasteach other like trains on opposite tracks. Theplate boundary is marked by a zone of activefaults—breaks in the rock and ground surfacecaused by plate movements. The most famousof these is the 1200-km (750-mi) long SanAndreas Fault. The San Andreas fault is a transform fault, a kind common on thesea floor but rarely found on land.Clarifying Questions:1. What is plate tectonics?2. How is the earth’s surface affected by the movement of the tectonic plates?3. Where do most movements happen in the Earth’s crust?4. What are three types of plate boundaries?5. Matching type: Plate BoundariesConvergent boundarya. Mid-ocean ridges, rift valleysDivergent boundaryb. Fault linesTransform boundaryc. Subduction, trench, mountains, volcanoes6.Matching type: Plate BoundariesConvergent boundaryDivergent boundaryTransform boundarya. Tectonic plates move apart.b. Tectonic plates come together.c. Tectonic plates slide horizontally past each other.7. Matching type: Plate BoundariesConvergent boundaryDivergent boundaryTransform boundarya. Himalayas and the Appalachian mountain rangesb. San Andreas Faultc. Atlantic mid ocean ridge, African rift valley8. Matching type: Convergent boundariesContinental to oceanicOceanic to oceanicContinental to continentala. Subduction, volcanoes, and trenchesb. Subduction, deeper trenches, volcanoesc. Mountain ranges like the Appalachian and Himalayas9. Why do earthquakes shake California?10. What is the San Andreas Fault?11. Identify and illustrate the movements of the different types of plate boundaries Use arrows to indicate directions.R. Angat

Matching Type Key:12. Matching type: Plate BoundariesC Convergent boundaryA Divergent boundaryB Transform boundarya. mid ocean ridges, rift valleysb. fault linesc. subduction, trench, mountains, volcanoes13. Matching type: Plate BoundariesB Convergent boundaryA Divergent boundaryC Transform boundarya. tectonic plates move apartb. tectonic plates come togetherc. tectonic plates slide horizontally past each other14. Matching type: Plate BoundariesA Convergent boundaryC Divergent boundaryB Transform boundarya. Himalayas and the Appalachian mountain rangesb. San Andreas faultc. Atlantic mid ocean ridge, African rift valley15. Matching type: Convergent boundariesA Continental to oceanicB Oceanic to oceanicC Continental to continentala. subduction, volcanoes, and trenchesb. subduction, deeper trenches, volcanoesc. mountain ranges like the Appalachian and 4 0

Matching type: Plate Boundaries _ Convergent boundary a. Himalayas and the Appalachian mountain ranges _ Divergent boundary b. San Andreas Fault _ Transform boundary c. Atlantic mid ocean ridge, African rift valley 8. Matching type: Convergent boundaries _Continental to oceanic a. Subduction, volcanoes, and trenches