Earth' Structure What's inside the earth? Fonte: https://www.learner.org/wp-content/interactive/dynamicearth/tectonicsmap/index.html In the early part of the 20th century, geologists studied the vibrations (seismic waves) generated by earthquakes to learn more about the structure of the earth's interior. They discovered that it is made up of these distinct layers: the crust, the mantle, and the core. Earth' Structure In 1915, Alfred Wegener published his book, The Origin of Continents and Oceans, suggesting that the earth's continents were once joined together in one large mass. He called the original landmass (or supercontinent) "Pangaea," the Greek word for "all the earth." Tectonic plates are gigantic pieces of the Earth's crust and uppermost mantle. They are made up of oceanic crust and continental crust. Plate tectonics is how those pieces move and interact with each other. It is a scientific theory that explains how major landforms are created as a result of Earth’s subterranean movements. Watch the video: Plate Tectonics The border between two tectonic plates is called a boundary. All the tectonic plates are constantly moving — very slowly — around the planet, but in many different directions. Some are moving toward each other, some are moving apart, and some are sliding past each other. Because of these differences, tectonic plate boundaries are grouped into three main types. ● Examples Use the map to see where the three different types of plate boundaries are found throughout the world. VOCABULARY: ● convergent plate boundary area where two or more tectonic plates bump into each other. Also called a collision zone. ● divergent boundary area where two or more tectonic plates are moving away from each other. Also called an extensional boundary. ● transform boundary site of tectonic plates sliding next to each other in opposite directions. Also called a transform fault. ● asthenosphere layer in Earth's mantle between the lithosphere (above) and the upper mantle (below). VOCABULARY: https://education.nationalgeographic.org/resource/plate-tectonics
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