OUR EARTH by Komal Tandon https://padlet.com/tandonkomal14/Bookmarks en-us 2021-04-01 06:13:27 UTC 2025-12-23 06:39:19 UTC hello@padlet.com The Earth is a unique planet. It is the only planet in the solar system that has life. This makes it unique. The existence of life on Earth is due to the presence of water, air (oxygen) and temperature that is neither too hot nor too cold. tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665849318 2021-08-01 09:03:09 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665849318 HOW THE EARTH BEGAN tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665849412 In the beginning, the Earth was just a huge ball of hot gases and dust. It was spinning very fast. As it kept spinning, the gases slowly cooled down and the surface of the earth became cold, hard and solid.]]> 2021-08-01 09:03:33 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665849412 INTERNAL STRUCTURE OF EARTH tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665849544 The Earth is a spherical ball. It consists of three major layers –
1.CRUST – The outermost layer of the Earth is called the crust. We live on it.
2.MANTLE – Below the crust lies the mantle. It consists of molten rocks called magma.
3.CORE – Below mantle lies the core. It is the innermost part of the Earth. It is extremely hot. It has hot gases and molten rock materials trapped under high temperature and pressure. https://www.youtube.com/watch?v=eXiVGEEPQ6c
]]> 2021-08-01 09:04:09 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665849544 IMAGINARY LINES ON THE EARTH tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665849751
AXIS - An imaginary line runs through the centre of the Earth from the North Pole to the South Pole. The Earth is tilted on its axis.

EQUATOR – An imaginary line runs half way through the centre of the Earth. It divides the Earth into two equal halves. The part above the equator is NORTHERN HEMISPHERE and the one below the equator is SOUTHERN HEMISPHERE.
]]> 2021-08-01 09:04:54 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665849751 MOVEMENTS OF THE EARTH tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665849894 https://youtu.be/l64YwNl1wr0
ROTATION
# The spinning of the Earth around its own axis is called rotation.
# The Earth completes one rotation in 24 hours. This period is called a solar day.
# The rotation of the Earth causes day and night.

REVOLUTION

# The movement of the Earth around the Sun is called revolution.
# It takes 365 ¼ days for the Earth to complete one revolution. This period is called a solar year.
# The revolution of the Earth causes seasons.
]]> 2021-08-01 09:05:31 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665849894 DAY AND NIGHT tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665850553 The rotation causes day and night. 
Day - At a time, only half Earth faces the Sun. This part of the Earth has day.
Night – The other half of the Earth is away from the Sun. This part has night. That is why when India has day, America has night.
The Earth rotates from west to east on its axis. Therefore, the Sun appears to rise in the east and set in the west. 
https://www.youtube.com/watch?v=hWkKSkI3gkU
]]> 2021-08-01 09:08:11 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665850553 SEASONS tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665850745 https://youtu.be/igCmW5jLF7k
https://youtu.be/WgHmqv_-UbQ
The tilted axis of the Earth and its revolution around the Sun causes seasons. This axis always point to the north. Hence, when the Earth revolves around the Sun, at a certain time of the year, either the northern hemisphere or the southern hemisphere is bent towards the Sun. At other times, both the hemispheres are at equal distance from the Sun. 

Summer - The hemisphere that is tilted towards the Sun gets the direct sun-rays and so it is warmer. It also has longer days and shorter nights.

Winter – The other hemisphere that is away from the Sun, gets slanting sunrays. It has shorter days and longer nights.

When India (Northern Hemisphere) and New Zealand (Southern Hemisphere), we find that when India has winter New Zealand has summer.

We have two other seasons – spring and autumn. These seasons are experienced when both hemisphere are at an equal distance from the Sun. When the northern hemisphere has autumn and the southern hemisphere experiences spring. This situation gets reversed after six months.

 . 
]]> 2021-08-01 09:08:51 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665850745 At the Poles : When northern hemisphere is tilted towards the Sun, the north pole has sunshine all the time. The south pole has night all the time. In the same manner, when the southern hemisphere is tilted towards the Sun, the south pole has sunshine all the time. The north pole has night all the time.Nordkapp in Norway is called the ‘ Land of the Midnight Sun’ as the Sun never sets here during summer from May 14 to July 30. This place has day all the time during this period.At the Equator : The Sun rays fall directly on the equator throughout the year. That is why, places near the equator are always hot. There are no seasons in these places. tandonkomal14 https://padlet.com/tandonkomal14/Bookmarks/wish/1665851059 2021-08-01 09:09:59 UTC https://padlet.com/tandonkomal14/Bookmarks/wish/1665851059