Discovering Design with Earth Science TextbookUnless you are using this course with someone else and they have the Answer Key and Tests manual you may want to order the set not just the textbook Recorded Classes are available for this subject. The classes are taught by Mrs. McKeeman. There are two recordings per chapter of the textbook. This laboratory based earth science course can be used for either eighth or ninth grade. Most homeschooled students should be ready for it in eighth grade, but