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Plate Tectonics- Anchor Assignment
Transcript of Plate Tectonics- Anchor Assignment
Earth's Layers The Crust Day 3
Plate Boundaries Day 2
Convection Currents Day 4
Continental Drift Plate Tectonics account for important
features of the earth's surface and major
geological events. The core is subdivided into two layers, the inner core (solid nickel and iron) and the outer core (molten nickel and iron) b. students know
earth is composed
of several layers: a cold brittle lithosphere; a hot, convecting mantle; and a dense, metallic core. c. students know lithospheric plates the size of continents and oceans move at rates of centimeters per year in response to movements in the mantle. d.students know that
earthquakes are sudden motions along breaks in the crust called faults and that volcanoes and fissures are locations where magma reaches the surface. e. students know major geologic events such as earthquakes, volcanic eruptions, and mountains building, result from plate motions. The mantle which is also divided into layers by density. The mantle is made up of very dense rock and is about 2,900km thick. One of the very important layers of the mantle is the asthensopshere which is a layer within the mantle that is not complete solid. It acts as silly putty, moving very slowly. The upper most layer of the mantle is solid and also part or another layer of the earth called the lithosphere (on average ~100 km but ranges from 5-250 km). The lithosphere is made of the upper most sliver of the mantle and the crust. The lithosphere is thickest under mountains and is the thinnest at mid-ocean ridges. http://www.learner.org/interactives/dynamicearth/index.html The Crust The Mantle Liquid Outer Core Solid Inner Core The Earth's Layers The crust is the least dense of the layers of the earth and ranges from 5-70 km thick. There are two main types of crust, oceanic crust and continental crust. Convection: the transfer or heat energy through liquids and gases, fluids, by moving particles.
Convection current: the pathway along which energy travels through a fluid. Until recently, geologists believed that convection currents on the asthenopshere caused the rigid plates above it to move. These convection currents cause hot mantle rock to rise, cool, and then sink again, creating circulation within the upper mantle. After molten materials rise to the surface and forms new oceanic crust at divergent boundaries, the plate cools and becomes denser. Convection Cont. Plate boundary: a place where the plates that make up Earth’s crust and upper mantle either move together or move apart or move past one another. Divergent plate boundaries are where the crust is stretched and thinned. At divergent boundaries, molten magma rises and erupts to form new oceanic crust. Tectonic plates collide at convergent boundaries. At these zones, crust is either piled up into mountain ranges by buckling, faulting, and folding along the plate boundary or is shoved into the mantle during subduction. Transform plate boundaries are two plates moving past each other without converging or diverging. The most famous transform plate boundary in the world is California’s San Andres fault. Subduction occurs of one or both of the converging plates is an oceanic plate. The oceanic crust is always driven beneath the continental plate. The subduction zone can be seen because the ocean trench that forms where the plates converge. The subduction of the dense oceanic plates causes volcanoes to occur. Kayla Mora As the mantle heats up it become less dense and rises. As it reaches the surface it cools and becomes more dense and sinks downward creating a convection current. Learning Objective:
Students know major geologic events such as earthquakes, volcanic eruptions, and mountains building, result from plate motions. And which plate boundaries cause these events. If you look at a map, Africa seems to snuggle nicely into the east coast of South America and the Caribbean Sea. In 1912, a German Scientist Alfred Wegener proposed that these two continents were once joined together then somehow drifted apart. He proposed that all the continents were once stuck together as one big mass called Pangea. He believed that Pangea was intact until about 200 million years ago. Evidence that the continents were once joined:
•Identical plant and animal fossils of the same age have been found in rocks on Africa and South America. This strongly suggests that the two were once joined. Some of the rocks found on each continent today show similar strata and ages. Mountain ranges on the coast of West Africa disappears then reappears again on the coast of South America. Plates are created when the continental crust begins to separate creating a diverging plate boundary. When a divergence occurs within a continent it is called rifting. Plate boundaries are responsible for earths major geolocial events such as earthquakes, volcanoes, mountain building, and sea floor spreading Convergent plate boundaries are Subduction zones which are responsible for volcanoes and mountain building Divergent Plate Boundaries are responsible for new sea floor spreading and create rifts in the crust. Transform Plate boundaries are responsible for earthquakes. Or Day 5
What do you already know about plate boundaries and geogological events such as earthquakes, volanoes, and mountain construction? ELL
Translation of new words in spanish.
peer/aide to help translate SPED
verbal and visual cues