Geogteacher's Blog

finding, writing and sharing Geography resources


Leave a comment

Global Atmospheric Circulation

bbc atmosphere

This title makes this sound a difficult topic to revise, but it isn’t. firstly, global = over the whole world, then atmospheric = to do with the atmosphere and finally, circulation = moving around. In other words its how and why the atmosphere moves around the Earth. And once you know this you can then link it to the ecosystems topic, as global atmospheric circulation controls a lot of world climates which of course influence different BIOMES. (The two biomes we studied are: semi-arid and tropical rainforest.)

Firstly remember that

Rising air cools as it rises, so it cools, water vapour will cool, clouds will form and therefore three is a HIGHER CHANCE OF PRECIPITATION IN AREAS OF LOW PRESSURE (sometimes called depressions)

Descending air warms and therefore there is no condensation and LESS CHANCE OF PRECIPITATION IN HIGH PRESSURE AREAS (sometimes called anticyclones)

Since it is hotter at the equator, air rises here and creates area of low pressure. (So there is a lot of rainfall here. This is where you get tropical rainforests.) This risen air spreads out from the equator, cools and descends around 30 degrees north and south of the equator (area of less rainfall so deserts and semi-arid biomes here). This paragraph describes the movement of the Hadley cell which you can see in this diagram; it is labelled 1.

global-atmos-circulation.png

Additionally the rest of the global circulation is very well explained by this American teacher to his class. You need only watch up to 4:00 minutes.

Once you think you understand this global circulation, test yourself and use p. 75 from the revision guide to link global atmospheric circulation to biomes. If you need some more help with this you can read p. 210-11 in New Wider world.


Leave a comment

How ecosystems function AND ecosystems under threat – Skeleton revision cards & key word lists

IMG_9472

Here is another set of revision resources for WJEC EDUQAS GCSE Syllabus B. For each of the topics there will be a skeleton revision card and a key word list. The idea is that by using them both you will have revised the whole topic. You could work out all the key words first and then use them to help you answer the questions on the skeleton cards or you could start with the cards and work out the key words as you go along. Be aware that summing up each topic with just 4-8 questions means that you will need to spend a lot of time on each one to cover the whole topic properly.

ecosystems – both topics skeleton card

Key words 3.1 and 3.2 ecosystems

I would really appreciate your feedback on what you like and would like altered and improved. Thank you.