Describes what the earth is made of, how it formed, and why it is still constantly changing its crust. Explores caves, tunnels, and deep holes to learn more about the planet's layers. This description may be from another edition of this product.
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.