Recommended
More Related Content
What's hot
What's hot (20)
Similar to Plate Tectonics - Structure and Movement of Earth's Crust
Similar to Plate Tectonics - Structure and Movement of Earth's Crust (20)
Recently uploaded
Recently uploaded (20)
Plate Tectonics - Structure and Movement of Earth's Crust
- 1. Plate-Tectonics Dr. suman Rawat Department : Civil Engineering Subject: Engineering Geology Semester: III, CBCGS
- 3. Internal Structure Of The Earth 1. Crust 2. Mantle 3. Core
- 4. Continental Crust - thick, less dense than oceanic crust and mostly old - about 25 miles (32 kilometers) thick under the continents -Is mostly composed of GRANITE Oceanic Crust -thin, dense - sinks under continental crust and young - is only about 3-5 miles (8 kilometers) thick under the oceans - is mostly composed of BASALT
- 5. MANTLE second layer of the interior of the earthLayers 1. Upper mantle. 2. Lower mantle. Thickness varies between 35km – 2900 km. Average density is 4.5 g/cm 3. Upper portion of mantle and crust together known as Lithosphere. Lower mantle – Aesthenosphere.
- 6. CORE CORE – divided in two layers 1. Inner core : Molten in stage Depth varies from 2900km – 5150 km. Density – 10.7 g/cm3. 2. Outer core :Solid in state High temperature High pressure Depth varies from – 5150 km – 6371 km. Density – 15 g/cm3
- 7. The Upper portion of the Mantle, which extends from crust to mantle boundary down to a depth of about 350 km, has two zones, the lower part of the upper mantle is called the ASTHENOSPHERE.
- 8. The Earth’s crust moves!!!!! -The continents have not always been arranged like they are today. - The Earth’s crust is divided into segments called plates.
- 9. The theory of plate tectonics states that “the Earth’s outermost layer is fragmented into a dozen of large & small plates that are moving relative to one another on top of the mobile Asthenosphere”
- 10. Plate tectonics Earth’s surface is divided into a few large, thick plates that move slowly and change in size • Plate is a large, mobile slab of rock that is part of Earth’s surface, bounded on four sides by weak plane surfaces • Plate consists of crust and upper part of the mantle
- 11. Convection Currents Earth’s surface is divided into a few large, thick plates that move slowly and change in size • Plate is a large, mobile slab of rock that is part of Earth’s surface, bounded on four sides by weak plane surfaces • Plate consists of crust and upper part of the mantle
- 12. Plate Boundaries Plate Boundary • Plate Boundary refers to the border between two adjacent lithospheric plates, usually classified by the relative motion taking place, convergent, divergent, or transform. • Plate boundaries can occur on landmasses (continents) or in marine settings (oceans) or both at the same time.
- 13. Three types of Plate Boundaries Plate Boundaries Divergent • Convergent •Transform
- 14. Three Basic Types of Plate Boundaries Divergent Convergent Transform USGS Graphics Using hands to show relative motion
- 15. Divergent Convergent Transform USGS Graphics Three Basic Types of Plate Boundaries
- 16. Hawaiian islands formed when the crust of the Pacific Ocean floor moved over a source of heat arising from within the earth.
- 17. Convergent Plate Boundary Convergent plate movement is associated with the following: a. Compression b. Reverse faulting c. Creation of a subduction zone d. Mountain building
- 18. Divergent Plate Boundary Divergent plate boundaries are associated with the following: a. Tension or extension (pulling apart) b. Normal faulting c. Rifting (as in the mid- oceanic rift zone) d. Creation of magma material inside the rift zone
- 19. Transform Boundary – San Andreas Fault Features/Landforms Associated with Transform Boundary • Transform boundaries are associated with the following: a. Horizontal grinding motion b. Strike-slip faulting c. Lateral offset of rock units z
- 20. Faults and Plate Tectonic Boundaries