The outside layer of our planet is an active place. Earth's crust is always growing and changing. But do you know how Earth's crust forms? And what happens when its plates shift suddenly? Find out more about the moves that make mountains and ocean ridges in this interesting book!
Hapgood's tour de force is back in print! This riveting account of how earth's poles have flipped positions many times is the culmination of Hapgood's extensive research of Antarctica, ancient maps and the geological record. This amazing book discusses the various pole shifts in earth's history -- occurring when earth's crust slips in the inner core -- and gives evidence for each one. It also predicts future pole shifts: a planetary alignment will cause the next one on 5 May 2000! Packed with illustrations, this book is the reference other books on the subject cite over and over again. With millennium madness in full swing, this is just the book to generate even more excitement at the unknown possibilities.
Examines the Earth's surface, including how it changes and why it shifts, and describes the formation of mountains, volcanic eruptions, earthquakes, and the movement of continents.
Hapgood utilizes ancient maps as concrete evidence of an advanced worldwide civilization existing many thousands of years before ancient Egypt. Hapgood concluded that these ancient mapmakers were in some ways much more advanced in mapmaking than any people prior to the 18th century. Hapgood believes that they mapped all the continents. This would mean that the Americas were mapped thousands of years before Columbus. Antarctica would have been mapped when its coasts were free of ice. Hapgood supposes that there is evidence that these people must have lived when the Ice Age had not yet ended in the Northern Hemisphere and when Alaska was still connected with Siberia by the Pleistocene, Ice Age 'land bridge'.
The fascinating truth about Atlantis leads to a chilling conclusion about the environmental catastrophe that destroyed it. Now you can find out how the forces that shattered the first great civilization on Earth can happen again, bringing the end of the world to us all! With an Introduction by Colin Wilson. Martin's Press.
Elastic Waves in the Earth provides information on the relationship between seismology and geophysics and their general aspects. The book offers elastodynamic equations and derivative equations that can be used in the propagation of elastic waves. It also covers major topics in detail, such as the fundamentals of elastodynamics; the Lamb's problem, which includes the Cagniard-de Hoop theory; rays and modes in a radially inhomogeneous earth and in multilayered media, which includes the Thomson-Haskell theory; the elastic wave dissipation; the seismic source and noise; and the seismographs. The book consists of 33 chapters. The first 16 chapters include basic material related to the propagation of elastic waves. Topics covered by these chapters include scalars, vectors, and tensors in cartesian coordinates, stress and strain analysis, equations of elasticity and motion, plane waves, Rayleigh waves, plane-wave theory, and fluid-fluid and solid-solid interfaces. The second half of the book covers various ray and mode theories, elastic wave dissipation, and the observations and theories of seismic source and seismic noise. It concludes by discussing earthquake seismology and different seismographs, like the pendulum seismometer and the strain seismometer.