|
Introduction :
4 550 million years ago, the Solar System and the Earth were born in the Universe which was built with millions of stars and huge clouds of gas and microscopic dust.
The Earth's formation :
Le refroidissement de la partie externe de la Terre provoque la condensation de la vapeur d'eau contenue dans l'atmosphère et l'apparition des océans.
It is the mass concentration of these cosmic dust, hit by meteorites, who formed the solar system.
Among the planets in formation, the Earth appears a hundred million years later.
At first, the Earth is hit by meteorites intensely, but then the hitting decreases, and is when the different layers of our planet differentiate: crust - mantle - core.
The continental crust begins to form from - 4 400 million years by thickening and solidification "of rock scum". An atmosphere rich in carbon dioxide is formed next.
The cooling of the outer portion of the Earth causes the condensation of water vapor contained in the atmosphere and it causes the appearance of the oceans.
Reminder on "Earthcaches": There is no container or logbook on the given coordinates. Just visit the site and answer the questions by e-mail.There is no need to wait for my reply, feel free to log immediately after. If the answers are incorrect, I will let you know. Happy caching!
To validate your visit:
1-. What does the Earth look like when it appears?
2-. Until when the first landmasses, which appeared 4000 million years ago, would grow?
3-. What is the origin of the gases composing the primitive atmosphere of the Earth?
You can contact me in: English, French or Spanish.
|