1 They could be symptoms of cancer of the lung, head, and neck. 2  Anyone with a cough that lasts more than a month or with blood in the mucus that is coughed up should see a doctor. 3  A change in bowel habits. 4  Most changes in bowel habits are related to your diet and fluid intake.
The theory of plate tectonics is a relatively new scientific concept. While its forerunnerâthe theory of. continental driftâhad its inception as early as the late 16th century, plate tectonics only emerged and. matured as a widely accepted theory since the 1960s (see This Dynamic Earth booklet).
Plate Tectonics and the Scientific Method Plate tectonics was orii lliginally call dlled the âTheory of Ci lContinental Driftâ originated by Alfred Wegener. The development of the theory is an excellent example of the application of the scientific method. Plate Tectonics represents a total shift of scientific paradigm. The prevailing view was that the continents had always had the same positions on the planet that they do today. This is a very lillogical view. However Wegener att t dttempted to provide