Earth History through images (Part I)

Earth is a planet formed nearly 4.6 billion years ago and life appears on its surface about 1 billion years ago.

I. Early period (4.6 billion - 570 million years)

Our Earth was formed about 4.5 billion years ago, parallel to the process of forming the Solar System. Now the Solar System is just a huge, rotating cloud of dust and gas, called the Solar Nebula, that was born from a big explosion about 13.7 billion years ago.

The oldest rock structure on earth is the first layer of the earth formed by molten lava flowing through cracks in the sea floor. Stone structures discovered in western Greenland said they were formed about 3.8 billion years ago.

A sea of ​​single-celled microbes has created oxygen and made the air on the earth begin to breathe. They absorb sunlight and through photosynthesis to produce oxygen. From there, the ozone layer gradually formed, protecting the earth from the fierce ultraviolet rays from the sun.

II. Ancient times (570 - 248 million years)

a / Cambrian period (570-500 million years)

Molluscs with hard shells appear. Fossils of this species indicate that they were present on the earth from 545 million years ago. The origin and evolution of this species - the ancestor of clams, snails, squid, and octopus - is still unknown.

First vertebrate appearance. The oldest fossil of vertebrates - which are non-functional fishes - was discovered in the 1990s, indicating they were present on the planet 530 million years ago.

b / Ordinary ordination (500- 435 million years)

The first cartilage fish - an ancestor of sharks - hovered in the oceans about 450 million years ago. Called cartilage because their skeleton is completely composed of cartilage.

c / Century Silurian (435 - 410 million years)

Animals of the spider class appear. Today we know that species of this group - including spiders, scorpions, and ticks - live on land; however, their ancestors started from the sea. It is thought that the scorpion is the oldest of this group, present around 430 million years ago. And at this time, their size was also very large, the fossils of a 2.5-meter-long marine scorpion were discovered.

Trees began to root on the ground about 430 million years ago. In order to move from aquatic environments to terrestrial life, ancient plant species developed a vascular system in the body to carry water and nutrients, in addition they developed a rigid framework that could help them Stand up straight on the ground.

d / Devonian Century (410 - 360 million years)

Amphibians began to emerge from the water about 370 million years ago. They are the first vertebrates to walk on the ground, evolving from a fish capable of breathing air.

e / Carboniferous century (360 - 290 million years)

The small continents come together, forming a single continent, Pangea.

Coal mines gradually formed from woody stems in lush swamp forests lush in coastal areas. Today's coal mines are found mainly in North America, Europe, and parts of Asia.

Reptiles begin to appear. The oldest animals of this class were present about 300 million years ago.

f / Permian Period (290 - 248)

Animal reptiles thrive thanks to the mainland's living environment at that time quite friendly and suitable for them. Adapt to hot, dry climates, they grow both in volume and in size.

Large mass extinctions have never been seen in earth history. About 95% of marine life and 70% of terrestrial animals are wiped out. The main reason is that due to the sudden and continuous changes in the climate , the earth is constantly warming up and cold suddenly making most of the creatures unable to keep up.

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Earth history

• Earth History through photos (Part II)