Humans lived on earth. It is the world of all of us. It is a shelter for humans as well as for other animals. Foods and other things that are needed for them are given by earth. The animals and plants that live on the earth are full of different variations. These differences happened because of the changes in the environment in many parts of the world. Earth affects all of the animals including humans as well as plants. Therefore we need to learn about the earth that we are living on even barely. You are going to learn some first and main information about the creation of the earth and the creation of life on it.

Humans lived on earth. It is the world of all of us. It is a shelter for humans as well as for other animals. Foods and other things that are needed for them are given by earth. The animals and plants that live on the earth are full of different variations. These differences happened because of the changes in the environment in many parts of the world. Earth affects all of the animals including humans as well as plants. Therefore we need to learn about the earth that we are living on even barely. You are going to learn some first and main information about the creation of the earth and the creation of life on it.

The Earth was formed from such a cloud of dust in space.
Picture: The Earth was formed from such a cloud of dust in space.

The earth we live in is a planet. It was formed approximately four thousand five hundred and forty million years ago. There are many thoughts about forming on the earth among scientists. However, the common opinion is earth was formed by a cloud of dust in space. That kind of dust of cloud is called a nebula. When the earth was forming it was very hot.

Then it started to become cold but still now the middle part of the earth (core) is really hot. The temperature of the earth’s core is estimated at around 6000 C°. The water boils at 100 C°so you can imagine how much the temperature of the earth. When a volcano gets blust these things in the earth’s core come out. They called lava.

lava
Picture: Lava

Organism evolved sometime after the forming of the earth. The first evolved thing which has life was really tiny and not visible for the eye. It is called prokaryote bacteria. This bacteria evolved two thousand five hundred million years ago.

The form of a Prokaryotic bacterium.
Picture: The form of a Prokaryotic bacterium.

The world’s first organism evolved in the sea. They came to land after some time. The firstly formed animals in the land were animals like the millipede which has some feet. That was in four hundred and twenty million years ago. That time was called the Silurian era.

Fossil of Opabinia that lived five hundred and forty-two million years ago. This was discovered in Canada
Picture: Fossil of Opabinia that lived five hundred and forty-two million years ago. This was discovered in Canada.

Non-animal plants were the first to spread the earth. That was the time called the Paleozoic era which before five hundred and forty-two million years ago. Comparing to the time of evolution of plants and animals, humans evolved after some long time. The details about that will be described in the next article.

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