Earth was once a frozen snowball. And before that, a sea of lava. The Sun. Volcanoes. Glaciers. Meteor impacts. They've all played their part. The planet has changed. How do we know? Without humans,... 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.