The ocean is, on the average, nearly three miles deep. The continents barely stick out above sea level. The rocks that make up the continents are lighter than the rocks of the sea floor. But those... 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.