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TRANSCRIPT
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Earth's Place In Space
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Earth's Place In Space
● Origin Of The Universe– Big Bang Theory – How our solar system formed
● Earth's Early Atmosphere● Evolution
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Origin Of The Universe
● Big Bang Theory– Scientists believe that there was a giant
explosion around 12-14 billion years ago.– Atomic particles from the explosion later
formed galaxies, stars, and planets.
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Supernova
– 7 Billion years ago, a supernova occurred from one of the first generations of giant stars exploding.
– A supernova occurs at the end of a stars life, releasing huge amounts of energy.
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Solar Nebula
– The energy released from the first generation of stars exploding, produced a solar nebula.
– A solar nebula is thought to be a spinning cloud of dust and gas.
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Solar Nebula
● Gravity caused the spinning could of dust and gas to collapse and condense forming our Sun in the center.
● The other lumps of matter that formed from the contracting dust and gas became the planets.
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Earth's Early Atmosphere
● 4.6 billion years ago, Earth was nothing more than a molten ball of rock surrounded by an atmosphere of hydrogen and helium.
● As the Earth cooled enough to form a solid crust, it was covered with active volcanoes.
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Earth's Early Atmosphere
● These volcanoes spewed out gasses, like water vapor, carbon dioxide, and ammonia forming Earth's early atmosphere.
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Earth's Early Atmosphere
● Very little oxygen ● No ozone layer
– Early life could only survive in the ocean (UV radiation)
● Early organisms used energy from the Sun for photosynthesis.– Conversion of the suns energy into chemical
energy by living organisms.– Oxygen was released as a byproduct.
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Earth's Early Atmosphere
● As oxygen increased, the ozone layer was formed protecting Earth from harmful radiation.
● This allowed for plant life to evolve and made it possible for the evolution of animal life on land.
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Evolution
● Precambrian: Multicelled organisms
● Paleozoic: Reptiles– Ice Age
● Mesozoic: Dinosaurs/Mammals
● Cenozoic: Early humans/Modern Humans