User:TravisTX/RfA Questions/Aliens on earth
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many scientist have differing views when it comes to the concept of alien life forms on earth. Some scientists, believe that "dinosaurs" and other life forms on earth that we know little about. I personally believe that e.t is the most famous made alien, with some people believing that this movie re-creation is of some what horror rather than of entertainment.
the next issue with the global deprevation is the origin of life, the essence of earth. The views on this vary dramatically depending on the religious, cultural and ethnic beliefs of the individual.
the acidic components of the hydrossphere may include may things.
Long-Term Forecasting Long-term forecasting is based mainly on the knowledge of when and where earthquakes have occurred in the past. Thus, knowledge of present tectonic setting, historical records, and geological records are studied to determine locations and recurrence intervals of earthquakes. Two aspects of this are important.
Paleoseismology - the study of prehistoric earthquakes. Through study of the offsets in sedimentary layers near fault zones, it is often possible to determine recurrence intervals of major earthquakes prior to the recorded historical record. If it is determined that earthquakes have recurrence intervals of say 1 every 100 years, and there are no records of earthquakes in the last 100 years, then a long-term forecast can be made and efforts can be undertaken to reduce seismic risk.
Example: The diagram below shows a hypothetical cross-section of a valley along a fault zone. The valley has been filled over the years with clays, sands, and peat (decaying organic matter). The upper peat layer is not yet cut by the fault. Peat is a useful material to geologists, since it contains high amounts of Carbon that can be dated using the 14C method. The ages for each of the peat layers are shown. The dates suggest that a major faulting event cut the lower peat layer sometime after it was deposited 440 years ago. The dates also show the middle peat layer was cut by a faulting event after it was deposited 300 years ago. If these faulting events were associated with earthquakes, this suggests a recurrence interval of about 140 years. Since the upper peat layer has not yet been cut by the fault and is 135 years old, we can speculate that within the next 10 years or so there may be another earthquake. This assumes, of course, that the two previous events are an accurate measure of the recurrence interval.
Zoom Dinosaurs is a comprehensive on-line hypertext book about dinosaurs. It is designed for students of all ages and levels of comprehension. It has an easy-to-use structure that allows readers to start at a basic level on each topic, and then to progress to much more advanced information as desired, simply by clicking on links.
