Plate Tectonics
Geography · प्लेट विवर्तनिकी · 14 facts
Minor plates include: Nazca, Philippine, Arabian, Caribbean, Cocos, Scotia, Juan de Fuca plates.
Wegener proposed Continental Drift Theory in 1912
Pangaea = supercontinent, Panthalassa = super ocean
7 major tectonic plates: Pacific, NA, SA, African, Eurasian, Indo-Australian, Antarctic
Pacific Plate = largest plate (oceanic)
Himalayas = Indian Plate + Eurasian Plate (convergent)
Ring of Fire = around Pacific Ocean, 75% volcanoes, 90% earthquakes
Richter Scale measures earthquake magnitude (logarithmic)
Focus = underground origin, Epicenter = surface point above focus
Seismograph records earthquakes
3 volcano types: Shield (gentle), Composite (steep, explosive), Cinder Cone (small)
Barren Island = India's only active volcano (Andaman)
San Andreas Fault = transform boundary (California)
East African Rift Valley = divergent boundary on land