Video 2.2: What came before plate tectonics? Early evidence showing striking similarities between regions on opposite sides of vast oceans suggested that in Earth's distant past what are now separate continents may once have been connected. Plate Tectonics Theory.
Donate or volunteer today! Plate tectonics is the unifying theory of geology.
Plate tectonics theory explains why: Earth’s geography has changed through time and continues to change today. This video segment adapted from A Science Odyssey uses animation and archival footage to provide an overview of the theory of plate tectonics. 5:43. 'pertaining to building') is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth's lithosphere, since tectonic processes began on Earth between 3.3 and 3.5 billion years ago. What you will learn from this video What you will learn.
Plate tectonics (from the Late Latin: tectonicus, from the Ancient Greek: τεκτονικός, lit.
Tectonic plates slowly move, creating …
As that plate is forced into the earth, it heats up, which pushes magma towards the surface of the earth. Main content. Pangaea - the idea of Pangaea and some of the evidence behind it ... Search for courses, skills, and videos. Pangaea - the idea of Pangaea and some of the evidence behind it. Video 2.3: How did plate tectonics get discovered? The idea that our planet's continents drift around the globe, periodically glomming together and breaking apart, is at least 200 years old, but most geologists didn't believe it until the 1960s when mounting evidence made it clear that the Earth's crust is broken up into fragments, and that those fragments, called tectonic plates, are moving. some places are prone to earthquakes while others are not. Khan Academy is a 501(c)(3) nonprofit organization. In the early 1900s, most geologists thought that Earth's appearance, including the arrangement of the continents, had changed little since its formation. Our mission is to provide a free, world-class education to anyone, anywhere. The Earth's surface is cracked into large pieces called tectonic plates. Plate tectonics is a related theory about how the continents drift. 6:12. You will get to learn about these ideas and related concepts, such as: Major lithosphere plates certain regions may have deadly, mild, or no volcanic eruptions. When plates meet under an ocean, or an oceanic-continental boundary meet, the thicker and more dense plate (usually the oceanic one) is forced below the less dense plate in a process called subduction. Video 2.4.1: The Earth's magnetic field 7:42.
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