Planet Earth looks blue from space because so much of it is covered with oceans of salty water. The oceans are home to lots of different animals. The oceans give people food, air and water.
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.