Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Schiehallion experiment wikipedia , lookup
Age of the Earth wikipedia , lookup
History of geomagnetism wikipedia , lookup
Algoman orogeny wikipedia , lookup
Geochemistry wikipedia , lookup
Oceanic trench wikipedia , lookup
History of geology wikipedia , lookup
Geological history of Earth wikipedia , lookup
Study Guide Quiz 2 Plate Tectonics The youngest rocks found in the ocean are found at the mid-ocean ridge The crust and upper mantle make up the Earth’s lithosphere Plates move anywhere from 1-12cm per year The plates of the lithosphere float on the asthenosphere The results of plate movements can be seen at plate boundaries The Himalaya mountains are the result of a collision between the indo-Australian plate and Eurasian plate The presence of the same fossils and same rocks found on different continents help support Continental drift Continental drift is the theory that the continents have slowly moved to their current locations Divergent boundaries are where plates are moving apart Iron material found in rocks at the mid-ocean ridge prove that Earth’s magnetic field has shifted in the past Transform boundaries are where plates slide past each other Convergent boundaries are where plates are moving towards each other Seafloor spreading occurs where molten material rises up from under Earth’s surface Scientist have found alternating bands of magnetism when studying rocks on the oceans floor In continental drift the continents have moved very slowly to their current positions Matching rock structures on different continents help prove the theory of continental drift Convection currents inside earth drive plate motion Density differences cause liquid rock to rise up through the asthenosphere In a convection current the hot material must eventually sink back into the earth The great Rift Valley in Africa is an example of a divergent plate boundary The Andes mountains are an example of a Convergent boundary Active volcanoes are most likely to be found at convergent oceanic to continental plate boundaries Mountain ranges form when 2 continental plates collide at a convergent boundary The San Andreas fault is an example of a transform boundary A subduction zone forms where 2 oceanic plates collide