History of life on Earth - Discover Math and Science Now
History of life on EarthPangea supercontinent from space, as it may have looked 300 million years ago. The Earth is a little over 4.5 billion years old, its oldest materials being 4.3 billion-year-old zircon crystals. Its earliest times were geologically violent, and it suffered constant bombardment from meteorites. When this ended, the Earth cooled and its surface solidified to a crust - the first solid rocks. There were no continents as yet, just a global ocean peppered with small islands. Erosion, sedimentation and volcanic activity - possibly assisted by more meteor impacts - eventually created small proto-continents which grew until they reached roughly their current size 2.5 billion years ago. The continents have since repeatedly collided and been torn apart, so maps of Earth in the distant past are quite different to today's.The history of life on Earth began about 3.8 billion years ago, initially with single-celled prokaryotic cells, such as bacteria. Multicellular life evolved over a billion years later and it's only in the last 570 million years that the kind of life forms we are familiar with began to evolve, starting with arthropods, followed by fish 530 million years ago (Ma), land plants 475Ma and forests 385Ma. Mammals didn't evolve until 200Ma and our own species, Homo sapiens, only 200,000 years ago. Source: timelineDuring its dramatic 4.5 billion year history, Earth has gone through a series of major geological and biological changes. The timescale below highlights a number of notable prehistoric events and the geological periods in which they occurred. 4.6 billion years ago2766695-9525Using the 8.5 x 14” paper provided, draw a “to scale” timeline of the events listed on the left.Your assignment needs to include:Each major event – clearly labelled (you may be creative)Scale used. (E.g. 1 cm = 1 million years)Needs to fit onto 1 8.5 x 14” paperLegible printingMarking: / 1000Using the 8.5 x 14” paper provided, draw a “to scale” timeline of the events listed on the left.Your assignment needs to include:Each major event – clearly labelled (you may be creative)Scale used. (E.g. 1 cm = 1 million years)Needs to fit onto 1 8.5 x 14” paperLegible printingMarking: / 10The origin of the Earth3.8 billion years agoFirst life arises2.1 billion years agoEukaryotes evolved1.1 billion years agoFirst sexually reproducing organisms570 million years agoFirst arthropods evolve530 million years agoThe first fish475 million years agoFirst land plants385 million years agoFirst forests370 million years agoThe first amphibians320 million years agoThe earliest reptiles225 million years agoThe dinosaurs evolve200 million years agoThe mammals evolve150 million years agoFirst birds130 million years agoFlowering plants evolve100 million years agoThe first bees evolve65 million years agoDinosaurs and ammonites become extinct14 million years agoThe first great apes appear2.5 million years agoGenus Homo evolves200 thousand years agoOur species, Homo sapiens evolves10 thousand years agoEnd of the last Ice Age ................
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