Final answer:
Rhyolites are felsic, extrusive igneous rocks that solidify from high-viscosity lava. They have an aphanitic texture and are often light gray to pinkish to reddish in color. Rhyolite lavas are highly viscous and slow-moving when erupted.
Step-by-step explanation:
Rhyolites are felsic, extrusive igneous rocks that solidify from high-viscosity lava. They have the same chemistry and mineralogy as granite but are finely crystalline, resulting in an aphanitic texture with crystals less than 1mm in size. Rhyolites are often light gray to pinkish to somewhat reddish in color.
Rhyolite lavas are highly viscous and slow-moving when erupted. They can appear as if they have flowed like oozing toothpaste. Rhyolites are produced from non-explosive volcanoes and are classified as high-temperature lavas.