At a depth of 32 km, basaltic rock melts at around 1,400°C but this same rock will melt at only 1,250°C at Earth's surface.  Group startsTrue or False

Where do rocks melt?A.At depths of about 50 to 200 km below Earth's surfaceB.On Earth's surfaceC.In Earth's outer coreD.At depths of about 50 to 200 meters below Earth's surface

In what location does rock melt, allowing for igneous rock formation?A.in Earth's inner coreB.In Earth's outer coreC.Between 50 and 200 km below Earth's surfaceD.Between 1000 km and 2000 km below Earth's surface

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

About 80 percent of the magma reaching Earth's surface is basaltic, with only about 10 percent andesitic and 10 percent rhyolitic.Group startsTrue or False

At depths of about 30-80 km, the rock that started as lowly DIRT and metamorphosed into a glimmering beauty is at such high temperatures and pressures that there is enough energy for beautiful garnet crystals to grow. We are nearing melting temperatures, but not quite. This is still a solid rock, but the high pressure-temperature conditions allow the rock to behave like playdoughGroup of answer choicesmarblegneissslateschist