Showing posts from August, 2010
The Respiratory System Life thrived on Earth primarily because of presence of Oxygen in the air. All animals and creatures living on earth have respiratory systems of various kinds, some may have lungs, others like fish may use gills, and yet o…
The Digestive System As we bite into something we want to eat and begin to chew, we initiate the activity of our digestive system. As our teeth crush the food, a watery substance called ‘Saliva’, from our salivary glands, gets mixed into the fo…
Skin and Sweating Skin is an elastic and waterproof outer layer covering of our body. It protects our body from bacteria and is sensitive to heat, cold and pain. Skin is wear resistant sice it constantly renews itself by replacing the upper lay…
Coming out of the base of the brain is a cluster of nerves which spread all over the body forming the nervous system. The brain stem leads into the spinal cord which extends along the vertebrae upto the tail bone. From the central nerve stem peri…
Chemicals which help our body to stay healthy are called vitamins. These are of six types, i.e., Vitamins A, B, C, D, E and K. Vitamin B can further be broken down into a number of types. Vitamins are present in our body but in very small quanti…
The Nose and Smell The nose helps us in breathing and smelling things. The outer side of the nose is made of thick skin which is supported outwards with the help of a cartilage protruding outwards from the skull. The cartilage divides the nose …
Eye and vision As we read through this book, we saw a lot of written text, and pictures, we were able to see the images and read the text with our eyes. The old saying ‘seeing is believing’ quite appropriately defines the importance and necessi…
Out body and its systems Our body is a wonderful machine made of billions upon billions of tiny cells. Our body is capable of many feets which include coordination between its various parts and balancing in various situations. The cells in our …
THE WORLD’S TEN GREATEST OCEANS & SEAS ( IN ORDER OF APPROX SIZE ) Pcific Ocean 16,62,40,000 sq kms. Atlantic Ocean 8,65,60,000 sq kms. Indian Ocean …
Crops of the world GROUNDNUTS are grown in many parts of the world, in some countries they are eaten after being roasted and salted. Oil is also extracted from these nuts and is used as a cooking medium in many countries. Besides this, groundnuts ar…
North America The North American continent comprises of Canada, United States of America, Mexico, etc. It has the Atlantic ocean on its East, the pacific ocean on it’s west, the Arctic ocean in its north and the continent of South America in the…
South America The south American continent has the Atlantic ocean on its East and the pacific ocean on its west. The Entire Eastern coastline is a continental shelf while the Andes mountain range stretches across the entire Western coast. The lo…
Europe The Europe continent is located north of the Mediterranean sea with the Atlantic ocean on its west. The eastern borders of Europe are formed by the Ural mountains and the Norwegian and Barents sea are in the north. Also in the north is a …
Africa The continent of Africa is the world’s second largest continent and has about 52 nations in it. It has the Atlantic Ocean to its west, the Mediterranean Sea to its north, the Red Sea to its North-east and the Indian ocean all along the E…
Asia Asia is the largest continent on Earth. It occupies one-third of the land surface. It has Africa and the Indian ocean to the south, the Arctic ocean to the north, the Pacific ocean in the east and Europe in the west. Asia is inhabited by tw…
Australia Australia is located on the Tropic of Capricorn and between the longitudes 110º and 155º east of Greenwich. It is both a country and a continent covering a total area of over 7.6 million sq. km. On its north and east is the Pacific Oc…
Antarctica and the arctic circle One the South pole lies a large mass of land, as big as the United States of America covered with snow and ice. This continent is called Antarctica is called Antarctica and it covers an area of more than 13.5 mil…
Name Size Caribbean Sea 2753000 sq kms. Mediterranean Sea 2503000 sq kms. Bearing Sea 2268000 sq kms. Gulf of Mexico …
NAME LOCATED IN Caspian Sea Asia. Lake Superior North America. Lake Victoria Africa. …
Forests Life would not be possible on the Earth without plants and as such forests make up one of the most important natural resources we have. They not only provide home and food to all kinds of animals, insects and birds but also provide us with w…
Power and electricity generation The advancements made by science and technology have not only developed new sources of power but have also increased our electricity nothing from our kitchen blender to the heavy industry would work. Electricity can …
Rivers begin their journey in the mountains and end it in the seas or in large lakes. As the river flows, it carries with it a lot of small rocks, mud and silt as it erodes the mountains and its banks. When it approaches the sea, a river fans out…
Expositing the Earth's resources The rocks on our planet are made up of minerals, in fact there are more than 3000 different minerals which make up the rocks. Even the sand on the beaches sontains a mineral called Quartz . Most of these min…
Deserts in the making Deserts are formed for various reason, which include rain shadow deserts which are formed because it rains on one side of a mountain and by the time the air reaches the other side, it is dry. The Gobi desert in Asia is an exam…
Natural springs of water Volcanic activity below the Earth's surface doesn't only result in eruption of molten leva, it also results in eruptions of hot water springs. In areas where volcanic activity is common water often seeps into t…
Fiords and atolls After the ice age, glaciers flowed down from the mountains, as they moved they cut the mountains to form deep 'U' or 'V' shaped valleys. As the glaciers disappeared these valleys were filled with sea water to f…
Where land and sea meet As wind flows over the seas and oceans it creates waves in the water and these waves move the water in a circular motion towards the shores. Land surface on the coastlines is forever changing because of the waves in the …
Land Cultivation Breeding of animals and growing of crops was probably one of the initial and most important steps taken by early man. Today land is cultivated to produce food, which includes vegetables, cereals, fruit, etc. The types of crops …
Crop rotation Different types of plants take in different types of minerals from the soil while growing. This makes it necessary to revitalise the soil regularly. In the earlier days farmers divided their fields into three parts, they did not …
While the Sun is rising on one part of the Earth, it is seting elsewhere, this is a result of the Earth's rotation on its axis. In order to keep a track of time in different parts of the world, the Earth is divided into various times zones. …
The Earth's Changing surface It is not only the activity below the Earth's crust which is changing the Earth's surface but contributing to the changes are also the effects of weathering and erosion. Both rocks and soil can be worn or…
Storms, Hurricanes and Tornadoes Storms are basically very strong winds. Most storms or Thunderstorms take place when large masses of warms air rise rapidly thus forming large cumulonimbus clouds, others may occur along cold fronts in temperate…
