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2 700 million years – 2.7 kilometres A large part of the bedrock in northern and eastern Finland is formed. Plate tectonics move continents together,… Read More »The Karelian bedrock

3 000 million years – 3 kilometres Oxygen-forming photosynthesis is starting, but the oxygen binds to minerals and the sea-water instead of being released into… Read More »Photosynthesis

3 500 million years – 3.5 kilometres Multi-species microbial growths are found in the seas as well as in rocks underground. Their fossils can be… Read More »Microbe diversity

3 800 million years – 3.8 kilometres Life may allready be present in the oceans. Remains of the cells sedimented on to the ocean floor… Read More »The first signs of life

4 000 million years – 4 kilometres Currently there is no single ’origin of life’ theory, but several contradictory hypotheses. We do not even know… Read More »Life emerges

4 000 million years – 4 kilometres The Earth is bombarded by meteorites. The orbits of Jupiter and Saturn synchronize, causing Uranus and Neptune to… Read More »Late heavy bombardment

4 280 million years – 4.3 kilometres The oldest rocks that still exist are formed. These can be found now in the Hudson Bay area… Read More »The oldest rocks

4 400 million years – 4.4 kilometres The Earth reaches its current size. The first crust and the oldest known zircon crystals are formed. These… Read More »Earth’s crust forms

4 530 million years – 4.5 kilometres The Moon is formed, most likely by a Mars-sized object, Theia, colliding with proto-Earth. In Greek mythology Theia… Read More »Moon forms

4 500 million years – 4.5 kilometres The core, mantle and crust of the Earth differentiate. The heavier elements sink to form the core, while… Read More »The layers of Earth differentiate