Billions of erosion and continents shifting has destroyed evidence of earths earliest stage. Its difficult to discover off and when the earth was truly formed.
Geologists use rocks and meteorites to learn about the birth of Earth.
The age of earth is discovered through the oldest rocks. The meteor crater in Arizona is helpful to geologists. They think earth is 4.5 billion years old.
The theory is that the sun was surrounded by a cloud of dust. Minerals formed from the dust cooling and they began to fall into each other.
Billions of years ago, the earth was made up of tons of small rocks, but modern earth is not like that.
Some believe the earth melted shortly after being created. Heavy pieces of rock sank and the earth melted to form the core. Molten earth was 2000 degrees and space was -400 degrees.
The temperature difference and bombardment of the planet caused constant volcanoes.
The thick layers of sediments and volcanic lava had been laid down billions of years ago.
The amount of iron in the moon tells us that it was formed from the earths crust.
Minerals found in amphibolites indicate that water was present at the time.
Banded iron tells us that oceans are about 4 billions years old. A meteorite found in 1998 was discovered to have contained salt.
In a meteorite fall in Mexico in 1969 is significant because two craters were made. The area of that field was 5 miles wide.
The discovery of amino acids in meteorites change the idea of where the building blocks of life came from because all life contains amino acids.