Seasons

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This is a basic ppt on seasons by me and my friends...

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Seasons:

S e a s o n s Sep 2011 Summer Project – Research based Learning by Team 2 : Joshua Rozario, Karan Jeyasankar, Surya Kishan, Juzer Abbas, Kushal Shetty, Kinston Gomes Grade 4V , Indian High School, Dubai

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Observations Questions in our minds Think about it Let us understand how and why – the cause The effects Things to Remember References Acknowledgements AGENDA

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Mumbai Monsoon, July, 2010 Observations

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Cold Winter Morning, Feb 2010, London Observations

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Summer in Australia, January 2010 Observations

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Autumn in Japan, Oct 2010 Observations

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Spring in the USA, March 2010 Observations

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Do you wonder.. why different parts of the globe have different seasons at the same time? why all places do not have the same seasons? can this be reasoned out or .. is there a supernatural force behind it.. Do not worry, the next few slides will answer some questions for us.. Questions in our minds

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If the pattern of seasons repeats every year, and it takes 1 year for every revolution of the Earth around the sun, then it could be this revolution that causes Seasons? The Earth’s orbit around the Sun is oval, so there will be few months when the earth is closer to the Sun and few months when it would be farther away. This may also contribute to this? The axis of the Earth is not vertical, but leans at an angle (tilted). So could this cause the differences in seasons? Think ABOUT it

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The Earth's seasons are not caused by the differences in the distance from the Sun throughout the year (these differences are extremely small). The seasons are the result of the tilt of the Earth's axis. The Earth's axis is tilted from perpendicular to the plane of the ecliptic by 23.45°. Let us further understand this.. LET us understand how & Why – the cause

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The earth can be imagined to be divided into two halves by an imaginary line, called Equator, which runs through the centre, perpendicular to the axis. The upper half called northern hemisphere and lower half called southern hemisphere. LET us understand how & Why – the cause In addition to the equator, there are two more imaginary lines called the Tropic of Cance r (in the northern hemisphere) and Tropic of Capricon (in the southern hemisphere). These lines lie between the equator and the poles.

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The earth’s axis is tilted at an angle, and as the earth travels around the sun, the axis remains tilted in the same direction. The result is that at certain times of the year, the northern hemisphere is bent towards the sun and exposed to it, while the southern hemisphere is away from it. At other times, the southern hemisphere is bent towards the sun and the northern hemisphere is away from it. LET us understand how & Why – the cause

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The hemisphere which is inclined toward the sun gets the sun’s rays directly and so is warmer – it has SUMMER The hemisphere which is away from the sun gets slanting rays and so is cooler – it has WINTER When the sun’s rays fall directly on the Tropic of Cancer, the northern hemisphere has Summer and the southern hemisphere has Winter. And vice versa when the sun’s rays fall directly on the Tropic of Capricon. LET us understand how & Why – the cause

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The intermediate stages cause SPRING and AUTUMN (FALL) During Summer in the northern hemisphere, the heat is absorbed by the land masses, warming the air above it.  The hot air rises, and cooler ocean air rushes inland from the southern hemisphere to replace it. As it moves, it carries moisture with it, releasing it over land as MONSOON LET us understand how & Why – the cause

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LET us understand how & Why – the cause Hence different parts of the globe have different seasons at any point in time, based on the exposure to the sun. Start of season dates would be as follows: Northern Hemisphere: Winter: Dec. 21 Spring: March 21 Summer: June 21 Autumn: September 22 or 23 Southern Hemisphere: Winter: June 21 Spring: Sept. 22 or 23 Summer: Dec .21 Autumn: March 21

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Why do some birds migrate from colder to warmer regions? - to avoid extreme cold.. the EFFECTS Why do some animals hibernate? - to keep themselves warm in extreme cold conditions..

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Why do some leaves fall in Autumn? - In preparation for winter, when there would be a shortage of Sunlight and photosynthesis cannot take place the EFFECTS These flowers bloom only in Summer?

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The spinning of the earth around its axis, called Rotation, causes day and night. While the earth spins, it also moves (revolves) around the sun in an oval shaped orbit. Seasons are the result of revolution caused by the tilt of the Earth's axis. Equator is the imaginary line that divides the earth equally into two halves, northern and southern hemispheres Things to REMEMBER Midway through the northern and southern hemispheres are the Tropic of Cancer and Tropic of Capricon respectively Angle of the sun’s rays falling on the northern and southern hemispheres cause the seasons – Summer, Winter, Autumn, Spring and Monsoon Seasons affect the lives of plants, animals and human beings

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Grade 4 Science Text – Frank Primary Science The magical.. World Wide Web http://en.wikipedia.org http://www.youtube.com/watch?v=DuiQvPLWziQ References

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Thanks to the team (and of course parents ) who put together this presentation acknowledgements

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Thanks to our Teachers and School for this great opportunity to learn about Seasons, Powerpoint and its use to make a presentation. THANK YOU for watching our presentation acknowledgements

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