Earth has changed much over history, some periods faster than others due to many factors that humans did not observe. In today's high-tech landscape and with ground-breaking processes for measuring the natural world around us (plus the world of the past) we now know more than we ever have about our planet. Essentials of that science are jam packed into this 6 page laminated reference guide that focuses on the facts succinctly and in an easy to read format organized with color coded sections and illustrations. More facts for your money than any other source, this tool can support a student's study of science at any grade level but also anyone interested in our home planet.