Pillow lavas form..... (Select all that apply)

Question

Pillow lavas form.....  (Select all that apply)

BlackTom AI · Accepted Answer

The question asks about pillow lavas and allows multiple selections. 
Option 1: 'as an intrusive igneous rock.' Pillow lavas are classic examples of extrusive igneous activity formed when lava erupts underwater and rapidly cools, producing rounded pillow-shaped structures. Describing them as intrusive igneous rock would be incorrect because intrusive rocks crystallize below the surface, not as erupted lobes on the sea floor. 
Option 2: 'under water.' This is a defining characteristic of pillow lavas. The interaction of hot basaltic lava with surrounding seawater causes rapid quenching and the distinctive pillow morphology, so this statement is accurate. 
Option 3: 'only in the Lau basin near Tonga' This claim limits pillow lavas to a single locale, which is false. Pillow lavas are found at many mid-ocean ridges and submarine volcanic settings around the world, not restricted to one basin or region. 
Option 4: 'during metamorphism.' Pillow lavas form from lava eruptions, not during metamorphic processes. Metamorphism involves mineralogical changes due to pressure and temperature, not the extrusion of lava into water. Thus this option is incorrect. 
Option 5: 'much of the seafloor' Pillow lavas are widespread along the global mid-ocean ridges and submarine volcanic zones, and in aggregate they cover substantial portions of the seafloor, making this statement broadly true. 
In summary, the true statements describe pillow lavas as extrusive features formed underwater and that they account for a large part of the seafloor, while the other options mischaracterize their origin, location specificity, or formation process.

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