Earth's climate since its origin has been understood to be in a state of flux. Its geological record has been one of wide variation over time and remains the subject of research whose results still... 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.