What causes tectonic hazards? L.O: To explain how the structure of the earth links to tectonic hazards. Starter: Make a simple copy of this diagram. Can you place the labels in the correct place? Leave a big space around the diagram. Mantle Crust Inner core Outer core
How much have you understood? It is a thin skin of rock around the Earth, like the skin on an apple. (8-65km thick) How much have you understood? Task: Complete the fill the gaps exercise. Extension: Come up with an analogy for the structure of the earth – it will help with revision. This is the hottest point of the earth. The pressure of all the other layers turns this into a solid ball of iron and nickel. (2,500km wide) Made of heavier rock that is so hot it has melted. It is mostly like soft toffee, and runny in places. (2,900 km thick) A boiling layer of liquid metal. (2,200km thick)
What are Tectonic Plates? There are many cracks in the crust that split it up into lots of different sections. These irregular sections of the earth’s crust are known as tectonic plates (make a note of this keyword). They are constantly moving in various directions – during this topic we will find out why and how.
Watch the video and answer: http://www.youtube.com/watch?v=QDqskltCixA&feature=related Watch the video and answer: 1) Which country used to be connected to Nigeria? 2) What forces drive the plates to move? 3) Name a place where the plates are moving apart.
The earths surface The earths surface is a thin crust. The crust is made up of big chunks – tectonic plates, these plates float on the earths mantle. Where 2 plates meet it is called a plate boundary different landforms occur at different boundaries The plates are moving slowly in different directions
Research: Plate boundaries Find out what the 3 types of plate boundaries are called and draw an diagram of each type in your books. Clue: Use http://www.platetectonics.com/book/page_5.asp
Only about 100 of these have a significant impact on human activities. In the average year, approximately 12 million earthquakes occur around the world. Every day there is about 8000 mini earthquakes, they’re not strong enough to be felt Only about 100 of these have a significant impact on human activities. 7