While doing fieldwork in Hawaii, you get the opportunity to witness firsthand a volcanic eruption. To get to the site of the eruption, you must hike a few miles over lava flows that erupted a few months earlier and are now cooled. You are walking on:
there are three types of rock sedimentary metomorphic and igenious, walking on lava that has cooled is igenious as igenious rocks are just lava that has cooled down
