ASTR 101 Lecture Notes - Lecture 28: Asthenosphere, Mariana Trench, Curie Temperature
5 Sep 2016
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The earth is active on small, fairly local scales. Earth is globally dynamic with enormous tectonic plates moving about the surface. Outflowing heat can cause convective motions in churning soup, and in the earth. This shows how they used to be arranged many years ago. Also, common fossils that are found in regions that are now widely separated on earth. Some couldn"t have developed in both regions, nor could they have travelled from one continent to the next through the water. Stratigraphy: similar geological formations in the appalachian mountains and the east coast of. Greenland as those found on the northwest parts of africa, parts of the british isles and scandinavia. 225 million years ago, continents all together = pangea. Continents drifting in various directions during triassic, jurassic and cretaceous periods. Wegener"s problem: he hypothesized entire continents plowing through the earth"s crust like an. No real physics, so couldn"t persuade scientific community, Wegener died in 1930 on a greenland expedition.
