The Sciences: An Integrated Approach has been used by over 100,000 students nationwide since it was published! The Sciences: An Integrated Approach, 4e is the only text on the market for the integrated science course. It integrates physics, chemistry, astronomy, earth sciences and biology for students with little or no science background. The new, fourth edition builds on previous editions by incorporating changes that meet reform curriculum guidelines. Given the dynamic nature of the science disciplines covered in Trefil's text, updated content is criticial. The new, fourth edition has thoroughly updated content throughout bringing the most up-to-date discoveries to the students in all five disciplines. it's broad approach that covers such a variety of the science disciplines, updated content is crucial. This revision has several significant changes.