Earth Sciences 1022A/B Lecture Notes - Lecture 1: Rock Cycle, Convergent Boundary, Hydrosphere
8 Oct 2016
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Important for energy and natural resources, solving environmental problems, building cities and highways and protecting against natural disasters (floods, earthquakes, volcanic eruptions, landslides) Uniformitarianism: fundamental principle the present is the key to the past o the physical, chemical and biological laws that operates today also operated in the past. Geological time is measured in billions of years. Big bang was around 14 billion years ago. Earth formed by the nebular theory (see diagram) o o o. Solar nebula of hydrogen and helium gravitationally contracted into a rotating disc. This rotating disc is the solar system our sun in the centre with planets and moon revolving around it o. Solar nebula rotating disc solar system. Within the disc, earth evolved through many collisions of rocky and metallic fragments into a rocky sphere divided into a: dense core, large mantle, light crust.
