The Difference in How the Public and Scientists Use "Theory"

The formal scientific definition of theory is quite different from the everyday meaning of the word. It refers to a comprehensive explanation of some aspect of nature that is supported by a vast body of evidence. Many scientific theories are so well established that no new evidence is likely to alter them substantially. For example, no new evidence will demonstrate that the Earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), th...

 The Impossibility of Continental Drift

Even more difficult to explain, than the breaking-up of a single mass into fragments, and the drifting apart of these blocks to form the foundations of the present-day continents, is the explanation of the original production of the single mass, or PANGAEA, by the concentration of the former holosphere of granitic sial into a hemisphere of compressed and crushed gneisses and schists. Creep and the effects of compression, due to shrinking or other causes, have been appealed to but this is hard...

 International Environmental Year Project

We don't have a perfect understanding of Earth's systems and processes; it may be unachievable in the face of such complexity. However, we continue to develop imperfect but useful mathematical models, and we have beer able to isolate physical variables in the laboratory. We should celebrate our capacity to learn quickly about such things; and we need to continue funding the search for this vital information. We may need to commit to an International Environmental Year project similar to the I...

 The Earth as an "Old Warrior"

Our earth is very old, an old warrior that has lived through many battles. Nevertheless, the face of it is still changing, and science sees no certain limit of time for its stately evolution. Our solid earth, apparently so stable, inert, and finished, is changing, mobile, and still evolving. Its major quakings are largely the echoes of that divine far-off event, the building of our noble mountains. The lava floods and intriguing volcanoes tell us of the plasticity, mobility, of the deep inter...