What did the earth look like in the first place? What did the Earth look like in the first place?

The first earth was an ocean!

The earliest animal on earth was actually a jellyfish.

Originally, the Earth was formed in nebulae in the formative period of the solar system. As a result of the accumulation of mass granular dust in the nebula, a relatively large new star body, the Earth, gradually formed. Originally, there was no atmosphere on the earth, and the earth's axis was not what it is now, there were no four seasons, and the temperature of the earth gradually reached more than 2,000 degrees Celsius under the irradiation of the sun and the continuous impact of asteroids.

All kinds of matter exist in liquid form (it is not an exaggeration to say that it is a fireball at this time), so under the influence of the Earth's rotation, heavier materials (mostly iron) are gradually deposited towards the center of the earth to form the core, while lighter materials float up to the surface to gradually form the crust. Since the earth's core is composed of metals (most of which is iron), in the process of forming the earth's core, a magnetic field is gradually formed due to the factor of electrons, and then magnetic poles are formed, which are now the north and south magnetic poles. At this time, there was still no atmosphere on Earth.

Because the mass of the earth is increasing, its gravitational pull is also increasing, and finally after a period of time after the earth stopped growing, a planet slightly smaller than the earth (note: not an asteroid) collided with the earth at an angle of about 45 degrees, and the planet was shattered, and the earth was also hit hard, causing the earth's axis to tilt by about 30 degrees, so there were four seasons formed, and the dust formed by the collision did not break away from the earth's gravity and gradually gathered to form our moon! (Even after work, the rest will be answered tomorrow!!)

Continuing from the previous time) Since there are many asteroids in the asteroid belt in the form of solid water, some of them deviate from their orbits and collide with the Earth (there are also many comets) in the asteroid belt, and the asteroids (or comets) melt and form water vapor. Due to the formation of the earth's magnetic field, the earth's blowing by the solar wind (charged particles) gradually lightens the atmosphere, and due to the earth's gravitational pull, its atmosphere gradually forms, but it is still very thin at this time. After hundreds of millions of years of accumulation, the temperature of the earth gradually drops, and the water brought by asteroids and comets gradually forms rain and falls to the ground, and gradually forms the ocean after accumulation.

During this period, the moon also gradually formed. The action of the Moon contributed to the formation of ocean tides on Earth, and it was only after the formation of the oceans that the temperature of the Earth dropped to the point where it was suitable for the emergence of life. I won't repeat it after life came along.

So the process of the formation of the earth should be: nebula - large planet (fireball) earth (no water) now earth (75 water) (end) Reference: It is recommended that the landlord often watch the "Exploration" program, I think the program is very good