Summary
Time flies really fast doesn't it? Well, that's a good cause MR HEAH IS BACK!!!!!! :DDDDD
so basically here are the things we have learnt throughout the term
Key Learning Points
1) How different things interact and work together to form a system
2)Balance is essential in every system
e.g. Thermodynamic equilibrium
Sara's example: Carbon dioxide, too little and we will freeze to death, too much and we will have global warming.
Its ironic that we are messing up the very balance that is keeping us breathing
3) Structure and composition of the atmosphere
-Nitrogen: 78%
-Oxygen: 21%
-Carbon Dioxide: 0.03%
-Other gasses: 0.97%
4) Importance of the atmosphere
-Block out UV rays
-provides oxygen
-keeps the Earth warm
5) The classic "place shapes people, people shapes place",that we have been learning since last year. Let's name this Heah's law :D
e.g. eskimos adapting to live in the cold
6) Global warming
WE HAVE TO DO SOMETHING ABOUT THIS PEOPLE!!!
7) The different types of rain, how do they occur and when do they occur.
-Relief (contributes to the formation of deserts)
-Frontal
-convectional
(adiabatic cooling is involved in all of the above)
8) Climate and weather
These 2 can always be seen as how warm and how wet a place is and is also dependent on its latitude and longtitude.
9) How to read a climograph
Apart from reading from the graph, we would also have to interpret the data or else all those numbers would just be useless.
10) Seasons and its relevance to the tilt and shape of the Earth
(refer to Minh's post dated February 23rd, very detailed)
11) How winds move
-The 3 cells (Hadley, Farrell and Polar)
12) Deserts
To clear up a common misconception, deserts are not formed where it is very warm, but rather where it is extremely dry. This can be expained byt the direction of winds which carry the water vapour which ultimately results in percipitation. :D
-Formation can be explained by tricellular model or relief rain
13) Drainage basin
-What happens to percipitation (Infiltrate, throughflow, baseflow, interception, throughfall, stemflow etc)
14) Hydrographs
-How to read them
-Its use (to predict the chances of flooding and how authorities have to evacuate the people before it starts to flood, or before the situation worsens)
In this case, the lagtime is very important to determine how much time they have to evacuate
-The factors which affect the shape and height of the hydrograph (shape,size, geology, etc)
15) River processes
-Transportation (the different types of loads)
-Erosion
16) Braided channels and deltas
17) Meanders
caused by -Diff velocities at diff parts of river
- Helicodial flow
How it can result in an oxbow lake
LIFE SKILLS
BE CONCISE
NEVER MEMORISE, UNDERSTAND
BREAK DOWN QUESTIONS
ITS ABOUT THE QUESTION NOT THE ANSWER
posted by 08ip01 at
12:28 PM
8 Comments:
In fact, global warming has become so serious that it might reach a point where we cannot correct it anymore. Methane has been a larger contributor to global warming than any other gas and if its concentration in our atmosphere reaches a point where it can melt the ice in Siberia and release even more methane, it might result in an endless cycle of positive feedback that will lead us to inevitable doom!
It is also important to consider the Milankovitch Cycles, a theory whereby 3 variations of Earth's movement will result in climatic changes. Taking reference from this theory, the Earth should be in the middle of a LONG PERIOD of COOLING.
We are already heating up our poor Mother Earth in this apparent period of cooling; imagine when we reach the supposed 'hot' stage.
It is spine-chilling to think what our off-springs have to endure.
What Weng kin said is absolutely correct. If we do not correct what we have done, which is to GREATLY reduce the amount of methane + CO2 emissions produced by us, we would live a real short life. All the people that are reading this blog, please act NOW! Use eco-friendly items like electricity saving lightbulbs and please turn-off the air-conditioners when not in use. This is for everyone's future.
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A small correction on the actual use of the Hydrograph.
Because only when the discharge exceeds a certain value, then flood starts to occur. Therefore, the lag time is actually loosely related to how much time we have before the flood. In simple English, even though lagtime always exists, if the peak discharge is still below the critical value of flooding, then there's still no flood at all. Similarly, if the critical value of flooding is low due to incapable city canal system for example, even though the actual discharge is far lower than the peak discharge flood still occurs.
However, the lag time can give us a rough idea of how much time that we have until the highest discharge occurs. It's important not only in protecting people from flood but also in water management or water allocation for hydroplants. For example, if the lagtime of a river during raining season is around 3 weeks for the last 20 years, then engineers may have a plan to start to release water from storage lake during the second week so that the lake will not be overloaded during the last week. Proper plan for water storage for agriculture or industry can be drawn by studying hydrographs as well.
in response to Wen Yi's comment) How exactly does the increase in CO2 levels result in us living shorter lives? Global warming may have colossal, severe and frightening effects (such as chaotic, un-seasonal floodings, earthquakes and tsunamis, not to mention the extinction of various plant and animal species, but I still think we will live out our natural lifespan. Cause, yes, the earth would get warmer, and we in already-not-the-coolest-place-on-earth-Singapore will suffer, but that's no immediate threat to our lives. Perhaps our offspring. Unless the emmissions of carbon dioxide suddenly increase, which it is unlikely to do because of the kyoto protocol and the like, it is improbable that one day *boom* and we all die. Unless you meant we will die in a flood or earthquake?
Maybe we can't be completely sure global warming will lead to the end of the world, afterall, increased temperatures increases evaporation, which increases cloud cover, which increases reflection back into space. We can't forsee everything. Maybe it's peposterous to think anything we tiny humans can do will have any significant impact on the planet. Afterall, compared with the next period of heating, or the next ice age, how significant is our action to the earth?
Perhaps it's not so much to the earth, but to ourselves, fragile little human beings who depend on the delicate balence of gases for survival. One thing's for sure: it will be a long, slow, drawn out apocalypse if we don't do something. it's not saving the world per se: it's saving ourselves.
One thing we can do: Eat less beef. As Wengkin mentioned earlier, methane's heat trapping abilities far exceed that of CO2. Cows belch copious amounts of methane into the air, and require much vegetable food to grow, (eg. maybe 20kg of corn or whatever to produce 1 kg of beef) which isn''t exactly saving ennergy. Of course no one's expecting the whole world to turn vegan, and even if we all pulled our weight global warming is unable to come to a sudden screeching halt. The cure will come about gradually (if indeed it comes about at all), and we all have a part to play in ensuring OUR OWN continued existence.
It is one of the most creative posts I have read so far. The author did not use teaching style, but listed a lot of examples for us to understand, but not memorise. However, I do think that this post is too brief, so that it does not really help students recap because the author just mentioned some parts without any further elaboration.
Global is very harmful to the southern country likeBangladesh
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