The variations in the composition of magmas govern whether eruptions are peaceful or explosive.Group startsTrue or False

Decreasing the pressure on hot rock generates most magma. Group startsTrue or False

Determine which of the following statements relating to magma are correct.Magma is a type of metamorphic rockMagma forms when rocks meltWhen magma rises to Earth's surface, it causes a volcanic eruptionWhen magma is deep below the surface, it is referred to as lava

Magma that is ejected during a volcanic eruption forms _____ igneous rocks.

Hawaiian volcanoes produce andesitic lava.Group startsTrue or False

Basaltic magma has the lowest viscosity, so more of it reaches the surface; the more viscous rhyolitic magmas are so sluggish that they tend to be trapped deep below the surface where they cool, solidify, and grow into the larger mineral crystals of plutonic rocks.Group startsTrue or False