The Earth is oblate spheroid (bulging at equators and flattening at poles) in shape. However, in the early days it was thought to be a flat piece of land. A major discovery with respect to the circumference and shape of the Earth was done in 25 BC. A Greek mathematician, named Eratosthenes, calculated the circumference […]
The Earth is a big ball-shaped moving body, mostly made up of rocks. It is the only planet in the solar system which has life. Life on the Earth became possible because of the availability of oxygen, the moderate temperature, the availability of water and the favourable atmosphere. It is the fifth largest planet of
Cenozoic era is the third major era after Precambrian period. The name Cenozoic was derived from the Greek word meaning ‘recent life’. This era is also called the ‘age of mammals’. Time Period: This era started around 70 million years ago, extending to the present time, in which we live. Features:♦ Flowering plants and insects
The Palaeozoic era was followed by the Mesozoic era. It was ‘the era of reptiles’, when dinosaurs ruled the world. It was the time of geologic and biological transition. It is divided into three major periods: Triassic, Jurassic and Cretaceous. Time Period: This era started 225 million years ago and lasted up to 70 million
The Precambrian time was followed by the Palaeozoic era. The first major period of this era was Cambrian Period (600 million to 500 million years). Major fossils show their earliest occurrence from this period. Time Period: It extends from around 600 million to 225 million years ago. Features:♦ The Palaeozoic is best known for explosion
Proterozoic eon is the third and last eon of the Precambrian time. Time Period: This eon extends from 2.5 billion to 600 million years ago. Features:♦ During this eon, the Earth started getting its present day shape and landforms arose. The Earth experienced global glaciation for the first time.♦ Life began to appear from simple
Archean eon or Archaeozoic is the second division of the Precambrian time. Time Period: It began around 4 billion years ago and extended till the beginning of Proterozoic eon 2.5 billion years ago. Features:♦ There were many volcanic gases in the atmosphere, but the dominating gas was carbon dioxide and the level of oxygen was
Hadean Eon is the first division of the Precambrian time. Time Period: The duration of this eon is between 4.5 billion (beginning of the Earth) to 4.0 billion years ago. Features:♦ This is the time when the solar system, including the Earth had just formed from the cloud of dust and gases. Those clouds and
Evolution of the Earth: Evolution of the Earth: Evolution is a process of gradual growth and development of life on the Earth from simple to complex form. Evolution of the Earth started around 4.5 billion years ago, when our solar system took shape due to the massive explosion of a small molecular ball called the
There was a Siberian husky; her name was Siberia. She had two friends. One was a Chihuahua; her name was Chichi. Her other friend was a Golden Retriever; her name was Goldie. She had fun with her friends. One day, Siberia and Goldie were going for a walk; Chichi came by. She saw them walking
There was once a baby crocodile. He had a beautiful shiny tail and all the other crocodiles were horrible to him because they were jealous of him. One day the baby crocodile counted all his beautiful shiny scales and there were a thousand, a lot more than he thought. So, he counted all the other
Two frogs had lived in a village all throughout their life. They thought they would like to go and see the big city that was about ten miles away.They talked about it for a long time and at last they set off to see the city. It was a hot day and they soon began
Once upon a time, there was a good old woman who lived in a little house. She had in her garden a bed of beautiful striped tulips. One night, the old woman looked closely and she saw, standing by each tulip, a little Fairy mother who was crooning and rocking the flower like a cradle,
A shepherd-boy lived in a small village. He watched a flock of sheep near a village. He used to call out the villagers three or four times by saying out, “Wolf! Wolf!” and when his neighbours came to help him, he always used to laugh at them for their pain and foolishness. And it had
Once upon a time, there lived a wise man by the name of Mamad. He never lied. The king ordered his subjects to bring him to the palace. The king was about to leave for the forest. The king held his horse by the mane; his left foot was already on the stirrup. He ordered