Plate Tectonics

सारांश

Plate tectonics describes the movement of rigid lithospheric plates over the ductile asthenosphere.

मूल विचार

प्रणाली को समझें

Plate tectonics describes the movement of rigid lithospheric plates over the ductile asthenosphere.

क्यों और कैसे होता है

कारण और संदर्भ

Plate motion is driven by the thermal and gravitational energy of the Earth system: mantle convection contributes, elevated ridges encourage gravitational sliding, and dense subducting slabs pull attached lithosphere downward. These forces create relative motion between rigid plates.

यह कैसे काम करता है

At divergent boundaries, mantle material rises and cools into new crust. At convergent boundaries, dense oceanic lithosphere may subduct or continents may collide and thicken crust. At transform boundaries, plates slide laterally and accumulated strain is released as earthquakes.

मुख्य तथ्य

• Oceanic lithosphere is generally denser than continental lithosphere.
• Subduction produces trenches, volcanic arcs and deep earthquakes.
• The Himalaya formed through collision of the Indian and Eurasian plates.

ज़रूरी शब्द

• lithosphere
• asthenosphere
• subduction
• seafloor spreading
• transform fault

उदाहरण और केस स्टडी

• The Himalaya and the Pacific Ring of Fire show contrasting collision and subduction settings.

कारण और घटक

• Mantle heat drives convection and contributes to lithospheric motion.
• Slab pull occurs as dense cold oceanic lithosphere sinks at subduction zones.
• Ridge push results from gravitational sliding away from elevated mid-ocean ridges.

प्रभाव और महत्व

• Divergence creates new oceanic crust through seafloor spreading.
• Convergence produces subduction, trenches, volcanic arcs or collision mountains.
• Transform motion generates earthquakes while conserving crustal area.

भूगोल से जुड़ाव

The Himalaya and the Pacific Ring of Fire show contrasting collision and subduction settings. This illustrates how plate tectonics varies by location, scale or environmental context.

बांग्लादेश से जुड़ाव

Bangladesh lies on the Indian Plate near the boundary systems of the Himalaya, Indo-Burma ranges and the Bengal Basin.

BCS प्रारंभिक के तथ्य

• Oceanic lithosphere is generally denser than continental lithosphere.
• Subduction produces trenches, volcanic arcs and deep earthquakes.
• The Himalaya formed through collision of the Indian and Eurasian plates.

BCS लिखित विश्लेषण

एक विश्लेषणात्मक उत्तर बनाएँ

• Compare divergent, convergent and transform boundaries by motion, landform and hazard.
• Explain how slab pull and ridge push help, but do not mechanically reduce, plate motion to one cause.
• Relate the Indian Plate's northward motion to Himalayan collision and seismic stress around Bangladesh and the Indo-Burma arc.

आम गलतफ़हमियाँ

• Continental collision does not normally create a mid-ocean ridge.
• Transform boundaries mainly conserve crust rather than create it.

झटपट दोहराव

• Plate Tectonics
• Oceanic lithosphere is generally denser than continental lithosphere.
• Subduction produces trenches, volcanic arcs and deep earthquakes.
• lithosphere / asthenosphere
• Definition → process → spatial example