IS2104: Atmosphere and Hydrosphere


Lesson #4 (26/1) January 26, 2010

Filed under: Uncategorized — 09ip01 @ 10:52 pm

Today’s lesson has been a fruitful one. I gained new knowledge on the Earth I live in. We learned about the lithosphere last year, so today, I learnt more about another part of the Earth’s system, the atmosphere and a little bit on the hydrosphere. So we all know that the atmosphere is composed of 78% Nitrogen, 21% oxygen and 0.05% carbon dioxide. Like what Mr Heah mentioned, every part of a system is there for a reason and with a proportion. What happens if any one part of the atmosphere disappears? Definitely not a good thing.

Carbon Dioxide, though occupies a very little percentage in the atmosphere, it is a temperature regulator. Without CO2, we will all freeze to death.

Nitrogen, an inert gas, occupies the largest percentage of the atmosphere, is important too. If there is no nitrogen, there will be an increase in percentage of oxygen and oxygen would become more concentrated, even though the amount of O2 doesn’t change. Oxygen being a reactive metal would react easily, forming oxides, which we won’t want to see it happen. If nitrogen disappears, pressure would also decrease and humans would burst up.

If oxygen is gone, we would just die because oxygen is a necessity to human life.

Another thing I learnt today is that the lithosphere, atmosphere and hydrosphere are abiotic. While the biosphere is biotic. Biosphere is basically living things. Living things regulate the a biotic region. For eg, in a volcanic eruption, CO2 is released into the air, which may result in global warming, the biotic part of the Earth would grow more plants to absorb the CO2.

In today’s lesson, I got a clearer picture on how our atmosphere sustains life and how the different parts of the earth are linked together.

Ming Li:)


Lesson #2 (20/1) January 21, 2010

Filed under: Uncategorized — 09ip01 @ 11:03 pm


Within this 30 min lesson, we were assigned, randomly, into various groups of 3s. 3 questions were then posted to us. The 1st being ‘ What have i learnt so far in this module.’ The 2nd being ‘ What do i want to learn from this module’, the last and most important was’ Why are you learning this module?’.

Various answers popped up, with most having the base line that Earth is a living system and that we would want to learn about the atmostphere etc and how it actually benefits us. We learn this module, so as to understand and comprehend the uttermost importance of Earth. A minute change in ,for example, the atmostphere, may be seemingly insignificant, yet, at the same time, may cause devastating effects, causing living things to perish.

We also learnt the significance of water. Water supports life and sustains it. A question about inhabitable Mars was brought up. There has to be something in the Earth’s atmostphere or a quality that makes Earth the only planet to sustain life in the entire solar system. Why is that so? In the previous lesson, we learnt that approximately 21% of the atmostphere is made up of oxygen. This exact percentage of oxygen always us to carry out respiration and stimultaneously prevent the world from burning up. Lets say that if 30% of the atmostphere consisted of oxygen, perhaps earth wouldn’t be a habitable place anymore. Similarly, water, has certain aspects that results it being so vital to human and plant life.Water is the UNIVERSAL SOLVENT,allowing numerous substances to dissolve in it.  Imagine our blood with little or no water, food molecules would be unable to be transported around our body. Air particles would be unable to diffuse in and out of the alveoli, due to the lack of the thin flim of moisture. We would resemble that of a wrinkled prune and probably,would cease to exist.

Using Satellite imagery, traces of dried up rivers have been seen on Mars. Could it be that there once had been life on Mars? Aliens? This spurs us on to protect our only home, Earth as there is a high chance that we will end up with the same fate as Mars.

Towards the end of the lesson, we were asked, still in our groups of 3s, to present 2 words that summaries this whole module. These words included : Equilibrium ( mantains the balance ) , system, air, water, atmostphere, hydrosphere, interdependant, interlinked etc.




Lesson #1 (18/1) January 20, 2010

Filed under: Uncategorized — 09ip01 @ 11:14 pm

The Earth is a living system.

What is a system?

– Comprises of things that work together

-Everything is related

-Perform a task





Using ideas from above, we were supposed to string them together to form a definition on what we think a system is :

A system comprises of parts that work together interdependently to perform a task.

“The Earth is a living system.” is/one of the key phrases of the module in my opinion as it aptly describes & relates to what we are going to learn about the atmosphere & hydrosphere. If we fail to understand this sentence, all or most of the concepts will not connect. Pure memorising of this topic is not advised & by the end of the module, it is expected of us that we will be able to talk about the hydrosphere & atmosphere just like the way we do for the (example) digestive system in secondary – like when the words hydrosphere & atmosphere, all the concept and ideas should follow.



Assignment Overview January 19, 2010

Filed under: Uncategorized — 09ip01 @ 11:56 pm

09IP01, the following is the order in which you are to write your reflections. It has been randomised to avoid any conflicts.

06: Jerlyn

25: Serena

02: Ming Li

03: Denise

04: Esther

23: Bryan

12: Rachel

09: Yu Wei

16: Wei Jie

19: Jeren

10: Paveta

01: Yvonne

24: Xi Ye

11: Khue

15: Khoa

13: Si Jia

07: Xin Yi

14: Dan Feng

22: Hun Quan

20: Chen Xi

08: Meredith

18: Qi Heng

21: Shira

05: Teresa

NOTE: The first person is to do his/her reflection on Monday, 18th January’s lesson.

You are reminded that this assignment constitutes 10% of your overall module grade. Hence, please complete your reflections as soon as possible after your assigned lesson is over.

In case you have forgotten, you are also to publish at least 5 comment on other’s reflections. I believe you are able to find your way around the blog? You are free to approach me for help.

Thank you for your co-operation?