Strata Volcano (explosive) Obsidian Volcanic Ejecta ffesic viscous mogmo) ah and

Question

Strata Volcano (explosive) Obsidian Volcanic Ejecta ffesic viscous mogmo) ah and rock very rapidy coolod Pumice (lithitied Pyroclasts gaseous (smaller sized) Pyroclasts (larger size) cb Scoria ooseous mofic mogmo Shield Volcano Basal Rapid cooing of magma Tuff (thified ash fiow Volcanic Breccia ithitied rock Mid-ocean ridge elsic Sea level Rhyolite or Andesits Continental Crust Oceanic Crust Granite Mafic Mafic magma chamber Rising mafic Mantle wedge Basalt forms the spreading occan floor Gabbro crystallizes crystallizej Rising fluids i upper mantej Spreading zone

Explanation / Answer

1) both siliceous and mafic rocks are present.

siliceous rocks present along subduction zone and mafic rocks along mid oceanic ridge

siliceous rocks are those whose silica content is more than 55 %

2) composite or strato volcanoes occur along subduction zone, and silicic rocks are common here.

shield volcanoes occur along the rift and basic rocks like basalt are common here.

thrust tectonics occur along subduction zone and extensional tectonics occur along mid oceanic ridge and rifts.

3) as diorite is an intrusive rock it is charecterized by large crystals. and it mostly ocuur as intrusions like dikes and sills

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