Plate Movements and Volcanoes- EVANS

Learn about plate movements, volcanoes, and earth science!

Study the key terms below and match them to the correct definitions Plate Boundary The edge of a tectonic plate Constructive plate boundary When two tectonic plates move away from one another e.g. The North American plate and the Eurasian plate Destructive plate boundary When the oceanic plate subducts under the continental plate because it's denser e.g. Nazca plate and South American plate The mantle The second layer of the earth which contains the convection currents and molten magma. Seafloor spreading The process of new crust forming at the ocean ridges and spreading outwards Continental drift The separating of continents by drifting across the oceans Left click on the terms and descriptions below and select which group they belong to. Convergent Plate Boundary (5) Plates move towards each other Can create mountains by creating folds Denser oceanic crust shifts under the lighter continental crust E.g. Nazca and South American plate Also known as destructive boundaries Divergent Plate Boundary (5) Occurs above rising convection currents E.g. The Mid Atlantic Ridge Also known as constructive boundaries The cause of oceanic ridges and seafloor spreading Plates move apart Transformative Plate Boundary (4) Plates slowly move past each other and can slip and move quickly Cause earthquakes Creates fault lines and fold mountains E.g. San Andreas Fault Plate movements Draw a diagram showing the 3 types of movements that occur at plate boundaries. Fill in the gaps by typing the words below into the correct spaces. Volcanoes are best described as places in the Earth's crust where lava erupts. This most often occurs at plate boundaries, but can also appear in isolated places away from plate boundaries where a lot of hot magma is being created, known as hot spots.There are four main types of volcanoes. The most simple is the cinder cone, which has an oval-shaped cone and a bowl-shaped crater at the top. Compositevolcanoes are made of layers of ash and hardened lava. Shield volcanoes are created when very thin lava erupts, spreading out over time and building hundreds of layers. The last type of volcano is the lava dome which has very thick lava which does not travel far, instead building up around the vent.The Ring of Fire is a ring of volcanoes around the Pacific Ocean that result from subduction of oceanic plates beneath lighter continental plates. Most of the Earth's volcanoes are located around the Pacific Ring of Fire because that the location of most of the Earth's subduction zones. Explain the term"subduction" in detail. Label 5 of the plates selected in the diagram below. Pacific Plate Australian Plate Eurasian Plate North American Plate South American Plate African Plate Filipino Plate Antarctic Plate Nazca Plate Define"pyroclastic flow" Label the compositional layers of the earth on the diagram below by clicking the points on the image. Crust Mantle Outer core Inner core Describe 3 pieces of evidence in support of plate tectonics and explain how it supports the tectonic plates theory. Geologists can use plate tectonics to estimate how old landscape features are. For example, Iceland is expanding by 2-5cm If the Atlantic Ocean is 4000km wide between South America and Africa (which appear to have been joined in the past), they can estimate its age.Iceland is about 250km wide. Calculate how long the island may have existed. 200 million years 12.5 million years 4 million years 3,000 years Match Gravity: volcano Click here to follow the link and start a game to practice your vocabulary. Make sure you change the "answer with" box to term instead of definition.