BIOL 1123 Lecture Notes - Lecture 35: Psychrophile, Continental Drift, Archean
13 Apr 2018
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Document Summary
Geological timescale: is a timeline of the earths history from its origin about 4. 55 billion years ago to the present. This is divided into 4 eons and subdivided into many eras. The first three eons are collectively known as the. The changes that have occurred in living organisms over the past 4 billion years are the result of genetic and environmental changes, such as: Climate and temperature: major fluctuations in temperature give rise and fall to ice ages that alternate with warmth all around the planet, simultaneously giving rise to tropical rain forests and the. Atmosphere: the chemical composition of gases has changed substantially over the past 4 billion years. Land masses: continental drift gives rise to new bodies of water and change the shape of lands. Glaciation: glaciers have moved across continents and this affects the water level of oceans. Volcanic eruptions: can cause extinction and formation of new islands.
