Discusses the divisions of time used by geologists to record earth's history and includes information on fossils, radioactive dating, and prehistoric life.
This book contains 22 true-or-false questions about rocks and minerals; readers may read the question on the right and turn the page to see the answer on the left.
Discusses the evidence gathered over the years by geologists that has led them to formulate certain theories about the formation of the earth and the continual changes that have been taking place ever since.