The Deccan Traps in India are primarily formedfrom multiple layers of this rock. Early geologistsstudying continental drift used the term“sima”[SIM-uh]for crust made primarily of this rock, andtheorized that a layer of it may have extendedunderneath continents. As this rock’s lava cools, itmay form columns such as those in Devils PostpileNational Monument in California.A’a [ah-AH]andpahoehoe [puh-HOY-hoy]are terms for flows of lavamade of this typically dark rock, which also existsat mid-ocean ridges in a form nicknamed “MORB”.Name this extrusive igneous rock, the primaryconstituent of oceanic crust
The Deccan Traps in India are primarily formedfrom multiple layers of this rock. Early geologistsstudying continental drift used the term“sima”[SIM-uh]for crust made primarily of this rock, andtheorized that a layer of it may have extendedunderneath continents. As this rock’s lava cools, itmay form columns such as those in Devils PostpileNational Monument in California.A’a [ah-AH]andpahoehoe [puh-HOY-hoy]are terms for flows of lavamade of this typically dark rock, which also existsat mid-ocean ridges in a form nicknamed “MORB”.Name this extrusive igneous rock, the primaryconstituent of oceanic crust
The Deccan Traps in India are primarily formedfrom multiple layers of this rock.