* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Continental Drift Notes
Survey
Document related concepts
Evolutionary history of life wikipedia , lookup
Paleontology wikipedia , lookup
Spherical Earth wikipedia , lookup
Schiehallion experiment wikipedia , lookup
Post-glacial rebound wikipedia , lookup
History of geomagnetism wikipedia , lookup
Biogeography wikipedia , lookup
Age of the Earth wikipedia , lookup
History of Earth wikipedia , lookup
Large igneous province wikipedia , lookup
History of geology wikipedia , lookup
Supercontinent wikipedia , lookup
Transcript
Plate Tectonics Our Dynamic Planet Continental Drift In 1912, a German scientist (he was an explorer, astronomer, and meteorologist proposed that at one time all of the continents had been ______________ to form one huge continent His name was ________________ He called this supercontinent _______________ (it means “all Earth”) And, over time (millions of years), the continents ___________________ and ended up in the positions we see on Earth today Continental Continental Drift Drift Wegener could even provide 6 pieces of evidence to support his claim 1) _________________________ ____________________ 2) _________ of the ____ organisms are found on _______________ 3) _____________ (ferns) have been found under _____________ ice! (What’s so weird about that??) Continental Drift 4) _____________ are found in _______________ (jaguars and ocelots) and ___________ (panthers and leopards) How did they get on 2 different continents – did they swim across the Atlantic Ocean? Also Similar ______________ found on 3 different continents: Ostrich (Africa), Rhea (S. America), and Emu (Australia) Continental Drift 5) ________ of certain ___________ appear to begin in one continent and end in another For example, diamonds in Brazil and S. Africa 6) ___________ in N. America and Europe line up Also, scars from ____________ appear on opposite continents Continental Drift Continental Drift – Matching Mountain Ranges Continental Drift – Glacier Evidence Continental Drift Wegener’s idea was ridiculed by geologists This is because while Wegener could provide evidence, he couldn’t provide an _____________ – an Earth __________ – that could cause huge land masses to move across the globe However, new technology finally led to findings to support Wegener’s theory Ultimately a new theory was formed called “______________” What is Plate Tectonics? Earth’s upper mantle and crust are composed of solid, rigid rocks This uppermost region is called the LITHOSPHERE T he lithosphere is broken up into separate sections called plates These plates (there are about 12) move over the less rigid (more fluid) material of the ASTHENOSPHERE (the lower mantle)