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Origin Theories

Marine Science Vocab

QuestionAnswer
Big Bang Theory Is a widely accepted theory for how material was created. All the matter was together in one small spot but then it started expanding and has been expanding ever since. The Big Bang is thought to have happened 13 billion years ago.
Galaxy a huge rotating aggregation of stars, dust, gas, and other debris held together by gravity.
Star A massive sphere of gas.
Nebulae clouds of dust and gas within a galaxy.
Condensation Theory/Nebular Theory Is how the solar system formed in a nebula that shrinks due to gravity and becomes so hot that two hydrogen molecules fuse. Energy is released during fusion and this hydrogen is the fuel for a star. The circling dust forms planets.
Accretion explains how debris circling a star collides with other debris and form larger objects that then collide with more debris and become larger. Gravity will help pull it all together.
Outgassing The volcanic ventilating of particles such as water vapor that had been trapped under the Earth's crust.
First Atmosphere Water vapor, carbon dioxide, nitrogen, ammonia, and methane were all gasses in the atmosphere. Their is no oxygen which is lucky because it breaks down organic matter.
First life Life started in tidal pools or deep ocean vents about 3.5 billion years ago and it was a simple bacteria like organism.
Timeline(life, oxygen, animals, fish, marine mammals, humans. Life 3.5 billion years ago, oxygen: 2 billion years ago, animals: 800 million years ago, marine mammals: 50 million years ago, and mankind: 3 million years ago
Created by: harrietbakken
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