Interview with G Bush

Ozone Gas depletion process

Here is an animation for better understanding of the Ozone gas depletion process.
Part - 1
Part - 2

Explanation:

1. The atmosphere acts as a natural filter, absorbing harmful shorter wavelengths such as X-rays, UV rays, Gamma rays yet allows life giving visible light and infrared wavelength to pass.
One such gas Ozone in ozonosphere protects us from UV rays.
2. Ozone is a molecule formed by three atoms of oxygen, weakly bounded together in an unstable arrangement.
3. As oxygen levels in Earth’s atmosphere increased over billions of years, some oxygen gas (O2) migrated into the stratosphere where the UV radiation reacted and formed ozone layer. In this way ozone layer formed.
4. After World War II, humans developed chemicals for electronics industries. These are chloroflurocarbons (CFCs) compounds. It comprises of chlorine (CI), fluorine (F) and carbon (C).
These CFC molecules are inert in lower atmosphere but causes havoc in stratosphere. The UV rays cracks the CFC molecule apart, freeing the chlorine (CI) atom.
5. In these photochemical reactions the freed CI atom starts destroying ozone molecules. It turns ozone into oxygen gas molecules.
6. The problem is that oxygen gas is transparent to UV rays. Thus, we have our present atmospheric condition where the increased UV rays are threatening the living systems on the Earth.

Well done!

The students of class 12 section C has shown that ICT in education is fruitful. They had utilised this blog and other offline tools to learn geography. Out of 27 students 6 got A1 grades and 15 of them scored Distinction and more marks in the Board Exam 2008. Surprisingly, students who took help from online and offline tools scored better marks than those who were averse to using ICT and related technologies in teaching.

Notice regarding Disaster Management, Unit 5 of Social Science, class X

Dear Students,
Disaster Management in Social Sciences of class X will now be evaluated through one Project work and one assignment.

Detailed new guidelines are as follows :-
1. Tests:
There will be no test from Disaster Management. Other things remain the same.
2. Assignments – Class and Home
You are expected to do 4 different assignments in Social Science. Out of these, one assignment will be from Disaster Management.The remaining three assignments will be from Geography, Economics & Pol.Sci and History. These assignments could be based on the suggested activities in the textbook.

3. Project Work:
Every student has to compulsorily undertake one project on Disaster Management only. You have to make a choice from the list of topics enclosed here. The textbook entitled “Together Towards a Safer India, Part III”, is recommended for carrying out the project work. You will be sharing your project with other students or teachers through exhibitions, panel discussions, etc

List of Disaster Management Topics for Project work, Class X

Disaster Management Book Class X Click here (3.5 Mb)

Social Science projects - IX

Why projects in Social science?

Education is a developmental process, which transforms us. It brings about a change in the mental and physical behaviour. To bring about this change, we need to introduce concepts, generalizations, issues and skills, which seem relevant to our lives.
Social Science is one of the subjects which brings all of closer to our environment, society
and the geographical, social , economic and political processes . It enables us to understand the process of social change and the role that we can play towards this change.
With the onset of new millennium, we are facing many challenges. Information explosion and widespread use of information technology has given us whole lot of information and data. Therefore its necessary for us to make sense out of it. In Social Science education particularly there has been a felt need to make its learning interesting, motivating and participatory in nature. Sensing this need we have to do projects in Social Science.

Students of class IX can download the Internal assessment Project list from here

Social Science Projects IX

(Note: You need Adobe Reader to view this pdf file)

Assignments for Board exams 2008

As the board Exams are on nearing up you may be trying hard and smart. Just to ease your learning here are some of assignmnets for Class XII Geography.
click on geography assignment to download.
All the Best to you all.

Indian States!!! See how much you know

How much do you know about the location and map of Indian states?

Want to know more about States.........then click on the map of india and start locating correct states.

There are max. 105 points if you answer all correct.

All the best.

Location of Plates

This Activity is a jigsaw puzzle. The plate tectonic map of the world has been cut into pieces randomly. Describe the major geologic features that correspond to plate tectonic boundaries, i.e., mid-ocean ridges, trenches, and mountain ranges.

Geography video for fun

Map Work for Class XII Geography

You may click the link given below for the map items and their answers of both sem. books.

Map Work for class XII 2008

It is not necessary to learn all the map items. Only a few of them are asked. I will talk about it later.
For practical book these are the instructions:
1. Try to make the file more visual than just a scrible note book.
2. If you are writing something about a topic try to give one example of it. The example may be a picture cutting, sample, or an excersise of stats or diagram or map.
3. The examples are generally shown on the drawing sheet on the same page. If the ruled sheet is on the right then the diagram must appear on the left drawing sheet.
4. Make two files. One for the practicals and another for the survey which can be a soft sprial folder.
5. Most important than making file book is how much you have understood about the practicals. There are some catch points such as the pie diagram starts from 12 o clock and the highest to lowest variables are shown in decreasing order. Data called Others is shown in the last.

Check out Our School's New Web Site

All the students must visit this web site for current happenings and events in our school and give your votes regarding school ehibition.

S.D.Public School Web Site