Where does the fire in volcanoes come from? How does magma find its way to the Earth's surface? What is the Earth's crust? What does a volcanologist do?
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.