Beneath continents,rising basaltic magmas are contaminated by sediments and continental-crust rocks,altering magma compositions;the resultant andesitic-to-rhyolitic magmas have high contents of SiO₂,relatively low temperatures,and high viscosity,which make it difficult for gases to escape,causing explosive eruptions.

Question

Quizplus · Accepted Answer

The statement is true. Basaltic magmas rising beneath continents get contaminated by other rocks, which alter their composition and results in explosive eruptions due to the high viscosity and difficulty of gases to escape.

Beneath Continents,rising Basaltic Magmas Are Contaminated by Sediments and Continental-Crust