Presentation on theme: "The location of tectonic activity"— Presentation transcript:
1The location of tectonic activity Identify, describe and explain the patterns of Earthquakes and Volcanoes
2Can you name the places where volcanoes and earthquakes occur?
3True or false? Volcanoes and earthquakes happen all over the world. Volcanoes are found in narrow belts.Volcanoes are found along the East Coast of North and South America.Volcanoes are found along the West Coast of North and South America.
9Skills Builder 1(a) Earthquakes occur in broad belts. Tend to be found in the middle of oceans e.g. Atlantic or along the edges of continents e.g. West coast of North America. Can also occur just off-shore of continental landmasses, e.g. western Pacific Ocean. There are some exceptions; there are earthquakes inland such as in eastern Africa. (b) Volcanoes also occur in broad belts. Found along the edges of continents e.g. West coast of South America. Can be found just off-shore of continental landmasses, e.g. western Pacific Ocean. Anomalies include cluster of volcanoes in the mid-Pacific around Hawaii and band of volcanoes inland in eastern Africa. N.B. Able students might note that earthquakes and volcanoes often occur in the same locations.
11On the diagram, mark and name: the North American Plate, the Caribbean Plate, the Pacific Plate, the African Plate, the Eurasian Plate, the Arabian Plate, the Indo-Australian Plate. Check your answers using Figure 4 (student book p.101)
13The structure of the Earth TASK 1Annotate (label) this diagram using the following words:Inner coreOuter coreMantleCrustPlatesPlate boundary
14The Structure of the Earth FACTSThe inner core is the centre of the earth, made of solid iron and nickel, it is the hottest part with a temp. of 5500oCThe outer core is made up of liquid iron and nickelThe mantle is made up of semi-molten rock, partially melted rocks are called magma, temperatures reach 5000oC here.The crust is the thinnest layer, and is made up of solid rock, it is the outer layer, like skin of an apple
16Tectonic Plates The Earth’s crust is divided up into plates These plates ‘float’ or move very slowly (a few mm per year) on the molten material of the mantle. This movement is caused by convection currents in the mantle.
17Explain the difference between continental crust and oceanic crust
18On the diagram below, mark and name: Inner core, Outer core, Mantle, Trench, Ridge. Check your answers using student book pp.101–102.
19Plate tectonicsThe place where two plates meet is called a plate boundary, most earthquakes and volcanoes happen here in a narrow belt called ‘zones of activity’
25Add to you descriptionb. Why do volcanoes and earthquakes happen in these locations
26Neatly add these correct labels: Generally explosive volcanic eruptions. Magma rising to form volcanoes.Plate being forced into the mantle Deep, violent EarthquakesOne plate is denser than the other so sinks. Plate melting.