Geological history of the EarthThree basic rock types: a) Igneous rocks

b) Metamorphic rocks

c) Sedimentary rocks

Basalt & granite

Sedimentary rocks

Fossils in sedimentary rocks

Geological ages

Biological time scales

Other time scales 1

Other time scales 2

Radiometric dating

Decay of radioactive isotopes

Biogeo time scales

Age of earth

Hydrosphere: 4.3 Gyr

Formation of earth

Formation of the moon

Interior heating

Moon’s interior has cooled off due to its small size.

Outgassing of earth atmosphere

lithosphere

Plate tectonics

San andreas fault

Seismic waves

Plate boundary