Tuesday, March 30, 2010

I Spy

Many methods are used to encrypt and decrypt a message. Coding a message in a way so as to make it unreadable for others is called Encryption, and making it readable again is called decrypting it. You need the same code to encrypt/decrypt a message – this code is called a cipher.

Morse code is a very common coding technique, in which each letter is represented by a sequence of dots and dashes. This was developed by Samuel F.B. Morse. For emergency signals, Morse code can be sent by way of improvised sources that can be easily "keyed" on and off, making Morse code one of the most versatile methods of telecommunication in existence. The most important Morse code is SOS – Save our Souls.

There are other ways of encoding a message. You and your friend can substitute each alphabet of your message with another and form a personal cipher! You can also use invisible ink and do some serious spying around!!!





Friday, March 26, 2010

LandForms

Landforms are the features that make up earth’s surface. They can be as big as Oceans, or as small as ponds! A formation of dirt and rock on the Earth’s surface is called a Landform.

Archipelago: A group of islands together is called an Archipelago. It can range from a few to thousands of Islands. As volcanoes erupt under water, they start to form land above the water which is what we call an island. As the volcanoes shift or a group of volcanoes erupt over years, they start to form a group of islands that we can call an archipelago.

Bay : A Bay landform is a body of water that is partially surrounded by land. You may think of it as a large lake opened to a bigger body of water such as an ocean. A bay has a much smaller opening than a gulf. Oceans have created many bays through erosion of land and deposits to the land. The Ice Age formed a lot of the bays we have today too.

Cove: A cove is small, horseshoe-shaped body of water along the coast; the water is surrounded by land formed of soft rock. E.g. Fisherman’s Cove.

Gulf: A gulf landform is the sea or ocean that reaches into land. When looking from outer space, it looks like the arm of ocean has extended into the land.

A gulf is formed naturally throughout time, either by erosion of land or through crustal movements of Earth.

Strait: Strait is a a narrow waterway connecting two larger bodies of water. There is land on two sides of a strait.

Isthmus: isthmus is a narrow strip of land with water on both sides connecting two larger pieces of land. An isthmus will have water on two sides.

Peninsula: is a part of land surrounded by water on 3 sides.

Channel: A channel is a body of water that connects two larger bodies of water (like the English Channel). A channel is also a part of a river or harbor that is deep enough to let ships sail through.

Geyser: Geysers are natural springs of water and steam, that occasionally come out of earth’s surface. Some Geysers erupt with amazing regularity.

Swamp: an area of land that is always soaked with water; low, wet land that supports grass and trees. A Marsh can not support trees, but a swamp can.

Fjord: Fjord is a narrow inlet of the sea between high banks or cliffs. Fjords are created by glaciers.

Cape: Cape is a curved or a hooked piece of land that extends into a body of water.

Lagoon: laggon is a shallow body of water. It is located near a sea or an ocean.

Valley: valleys are low lands located between high hills or mountains.

Prairie: A prairie is a wide, relatively flat area of land that has grasses and only a few trees. Prairies consist of large plain areas and tall grasses.

Waterfall: When a river water makes a sharp drop, usually over a cliff, it is called as a waterfall. A cascade of waterfalls is called a Cataract.

Cliff: Cliffs are almost vertical formations made of rock and soil. It is rather high and has a very steep slope.

Butte/Mesa: A mesa is a land formation with a flat area on top and steep walls - usually occurring in dry areas. A butte is a flat-topped rock or hill formation with steep sides. Mesa are bigger than Buttes.

Plateau :Plateau is a flat highland area with one steep face. It also boasts of elevated plain.

Canyon: Two steep cliffs with a valley running between them. There is often a river that runs through the two. A canyon has to be formed through erosion.


Friday, March 19, 2010

Indian States



India - the country we live in is truly a special place. It is the 2nd populous, 7th largest country in the world. On 15 August 1947, India gained independence from British rule, but at the same time the Muslim-majority areas were partitioned to form a separate state of Pakistan. On 26 January 1950, India became a republic and a new constitution came into effect. India is a republic consisting of 28 states and seven union territories with a parliamentary system of democracy.




States:

1. Andhra Pradesh 2.Arunachal Pradesh 3.Assam 4. Bihar 5.Chhattisgarh 6.Goa 7.Gujarat 8.Haryana 9.Himachal Pradesh 10.Jammu and Kashmir 11. Jharkhand 12.Karnataka 13. Kerala 14.Madhya Pradesh 15.Maharashtra 6.Manipur 17.Meghalaya 18.Mizoram 19.Nagaland 20.Orissa 21.Punjab 22. Rajasthan 23.Sikkim 24. Tamil Nadu 25.Tripura 26.Uttar Pradesh 27.Uttarakhand 28.West Bengal

Union Territories:

A. Andaman and Nicobar Islands B. Chandigarh C. Dadra and Nagar Haveli D. Daman and Diu E. Lakshadweep F. National Capital Territory of Delhi G. Puducherry



Thursday, March 11, 2010

COLOURS



COLOURS

All colours, as we see them, form the visible spectrum of light, and they come from the WHITE light.This can be seen by passing sunlight through a prism.
Our eyes have ‘Rods’ and ‘Cones’ that work together to give us the complete perception of light. There are about 120 million rods and about 6 to 7 million cones, in the human eye. Rods are more sensitive than the cones but they are not sensitive to colour. Cones can detect three of the visible colours - red - blue and green. People who suffer colour blindness have less numbers of particular cones than normal, so they get colours confused.

The primary colours are red blue and yellow. Primary colours cannot be made from other colours. Artists create all the other colours of the rainbow by mixing together the primary colours. The secondary colours are green orange and violet. Secondary colours are made by mixing two primary colours. Each secondary colour is made from the two primary colours closest to it on the colour wheel
When placed next to each other, complementary colours tend to look balanced and are colours opposite to each other on the colour wheel.