ENVS 1060 Lecture Notes - Lecture 3: Mid-Ocean Ridge, Mid-Atlantic Ridge, Oceanic Crust
16 Dec 2015
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Describe what a mantle (convection) plume is. (ans). structures within the mantle that are hotter than normal mantle material. This causes an upwelling of the hotter magma and the sinking of the colder denser material (convection movement). The plumes cause magma to rise up to the earth surface and may result in the occurrence of hot spot volcanoes. They are usually in a fixed position over time: list the major pieces of evidence used to support the theory of plate tectonics (such as similar fossils on both sides of the. You should be familiar with at least four pieces of evidence that support the theory. (ans). The continents are all shaped as though they fit together like pieces of a puzzle. Fossil comparisons along the edges of continents also look similar, this would only make sense if two continents were once joined together. discovered and the major pieces of supporting evidence. (ans).
