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* Events & Evidence *Event: The Earth formed by dust and minerals sticking together in the nebula *Evidence: Salt sticks together in space, so minerals and dust must too. * *Event: The Earth completely melted from radioactive elements *Evidence: The Earth has internal layers: core, mantle, and crust * *Event: The Earth and the whole solar system formed about 4.6 billion years ago *Evidence: Radiometric dating of meteorites * *Event: The Earth survived a giant impact *Evidence: Moon rocks are low in iron, so must be formed from Earth’s crust material that got knocked off * *Event: A thick crust and continents formed 4.3 billion years ago *Evidence: Amphibolite rocks only form 12 miles deep and they are 4.3 billion years old. * *Event: Oceans formed 4.3 billion years ago *Evidence: Banded Iron formations only form under water and they are 4.3 billion years old * *Event: Water came from space in meteorites, drop by drop *Evidence: Salt in meteorites contains water droplets, and the salt is 4.5 billion years old * *Event: Amino acids, a building block of life, came from space *Evidence: Amino acids were found in meteorites 4.5 billion years old * *Event: The Earth’s atmosphere changed from toxic to oxygen, allowing advanced life to develop. *Evidence: 3.5 billion year old stromatolite fossils show that cyanobacteria began to create oxygen gas. *