Monday, 31 May 2010

Syllabus - bugger now I have to learn something - Lesson 1 Plate Tectonics

As dictated by the powers that be in a stuffy office with a small window that lets in very little light

The Physical Options
Plate tectonics and Associated Hazards
Weather and Climate and Associated Hazards

The Human Options
World Cities
Development and Globalisation

In the words of the great meerkat, "Simples"

In a bit more detail, Plate Tectonics and associated hazards
Earth structure, plate tectonics theory: convection currents and sea-floor spreading. Evidence:
continental drift and palaeomagnetism.

Destructive, constructive and conservative plate margins. Processes: seismicity and vulcanicity.

Associated landforms: young fold mountains, rift valleys, ocean ridges, deep sea trenches and island arcs.

Hot spots associated with plumes of magma and their relationship to plate movement. and altitude.

The Earth's Structure could be compared to a Scotch Egg

However, to be more scientific, the earth's structure has many layers and an article can be found here. try to remember the mnemonic for the layers of the Earth - CMC Cool Moody Cows (Crust Mantle Core), the lower two are split into two layers. Upper and Lower Mantle and Outer and Inner Core.

Like with most things, try to remember three facts about the structure of the Earth per section. Write these on card index files. Why three? This tells you all.

Have a look at this video to remind you of the fun of the structure of the Earth.

Plate Tectonic Theory - The crust of the Earth is made up of major and minor plates from the formation of the Earth. Find out what Alfred Wegener did with plate tectonics. Here is the first video of a series of plate tectonics. Admittedly, it may be a bit boring but it will help for those facts to soak in at the end of a boring day. It is worth the long haul. Try to remember the names of three major plates and three minor plates with their locations, more if you can, whack them down on an index card.

Convection currents - imagine a pot of soup with the heat on with lumps of bread on top, the bits of bread are the plates, the soup is the upper mantle with the convectional heat patterns that move the bits of bread around. It is put more succinctly here. Also exhibited in lava lamps or in a fish tank. What are your three facts on these currents, they are not sultanas?

Sea floor spreading is a bit like the stretch marks on my stomach or if you have cut your hand, blood flows out and then a scab forms. For the technical point of view have a look here. Make yourself a coffee or dig out a can of coke out of the fridge and watch this.

Continental Drift - if you listened to the video, you would have heard of this, but what is it, before looking at wikipedia - jot down three facts on an index card about continental drift...Now have a look here and then after reading that - write three more facts on the back of the index card. A quick and non intensive video about Continental Drift is found href="http://www.youtube.com/watch?v=hSdlQ8x7cuk">here.

Finally, palaeomagnetism - already mentioned once again in the Discovery Channel video - big bloody word, but what does it mean? Palaeo=geologically old and Magnetism=well I am sure you know that one. Now where can you find evidence of this palaeomagnetism? Dig out the cards and write three facts on the index card, then read here, then three more new facts.

Prepare yourself for next time with this.

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