tectonic plates G1
^^DIVERGANT PLATE BOUNDARY^^
oceanic oceanic : new sea floor, mid oceanic ridge, volcanic islands, ==earthquake==
- mid- atlantic ridge formed between north american and eurasian plate
continental continental : block mountain, rift valley, ==earthquake==
- nubian boundary and somalian boundary of afrian east plate formed east afrian rift vallry
^^CONVERGANT PLATE BOUNDARY^^
oceanic oceanic : @@oceanic trench@@, volcano, arc of islands, ==earthquake==
- pacific plate and philippines plate formed mariana trench and mariana islands
oceanic continental : @@oceanic trench,@@ volcano, %%fold mountain%%, ==earthquake==
- austrialian plate and eurasian plate formed sunda trench and barisan mountains
continental continental : %%fold mountain%%, ==earthquake==
- indian plate and eurasian plate formed himalayas
^^TRANSFORM PLATE BOUNDARY^^
==earthquake==
- san andres fault between pacific plate and north american plate
==EARTHQUAKES==
→ when plates slide past each other, friction between moving plates, cause stress to build up
→ energy is stored up in earth’s crust, rock no longer contain pressure, energy released
→ large faults occurs, rocks break up, energy radiate in shockwaves, move in series of sudden jerks
@@OCEANIC TRENCH@@
→ long, narrow deep, formed at the zone of subduction
VOLCANO/ ARC OF ISLANDS
→ subducted plate causes mantle material to melt, forms magma, rise through fractures in earth crust
→ (may form arc of islands)
%%FOLD MOUNTAINS%%
→ immense pressure resulted from compressional forces, cause continental plate to buckle and fold sideways
RIFT VALLEY
→ sections of crust extend along fault lines, ^^tensional force^^ causes central block of land to ^^subside^^ between ^^pair of parallel faults^^
→ formed linear depression, volcanos, earthquakes
BLOCK MOUNTAIN
→ ^^tensional force^^ causes land masses around central block to ^^subside^^, formed between ^^pair of parallel faults^^
→ had sleep slopes, left standing higher than surrounding land
NEW SEA FLOOR
→ magma rises from mantle to zone of divergence
→lava flows out onto sea floor, cools and solidifies, process : sea floor spreading
MID OCEANIC RIDGE
→ magma piles up, solidifies, forms chain of mountain on either side of spreading zone
→ plates continue to move apart, mountains move away from spreading zone to form new one
→ youngest nearest to spreading zone, oldest furthest
UNDERSEA VOLACANOES/ VOLACANIC ISLANDS
→ at various points along mid oceanic ridge, magma piles up and solidify
→ formed undersea volcanoes
→ volcanic islands : grow above sea level