Lecture ONE-1.pdf - Al-Karkh University for Sciences College of Remote Sensing and Geophysics Geophysics Department The Dynamic and Evolving Earth by Dr

Lecture ONE-1.pdf - Al-Karkh University for Sciences...

This preview shows page 1 - 3 out of 7 pages.

1 Al-Karkh University for Sciences College of Remote Sensing and Geophysics Geophysics Department The Dynamic and Evolving Earth by Dr. Rami M. Idan
Image of page 1
2 Introduction What kind of movie would we have if it were possible to travel back in time and fi lm Earth’s history from its beginning 4.6 billion years ago? It would certainly be a story of epic proportions, with incredible special effects, a cast of trillions, a plot with twists and turns and an ending that is still a mystery! Every good movie has a theme, and the major theme of The History of Earth is that Earth is a complex, dynamic planet that has changed continuously since its origin some 4.6 billion years ago. Because of its epic nature, three interrelated sub-themes run throughout The History of Earth . The first is that Earth’s outermost part is composed of a ser ies of moving plates (plate tectonics) whose interactions have affected the planet’s physical and biological history. The second is that Earth’s biota has evolved or changed throughout its history (organic evolution) . The third is that the physical and biological changes that occurred did so over long periods of time (geologic or deep time) . These three interrelated sub- themes are central to our understanding and appreciation of our planet’s history. As you study and read the various topics covered in this book, keep in mind that the themes and topics discussed in this chapter and throughout the book are like the interconnected components of a system, and not just isolated and unrelated pieces of information. By relating each chapter’s topic to its place in the entire Earth system, you will gain a greater appreciation of Earth’s evolution and the role of its various interacting internal and external systems, subsystems, and cycles. By viewing Earth as a whole that is, thinking of it as a system we not only see how its various components are interconnected, but we can also better appreciate its complex and dynamic nature. The system concept
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 7 pages?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes