EESA06H3 Lecture 7: Planet Earth-Lecture 7.docx

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Petrology: rock, study rocks and look on mineralogy. Rocks: are the only record we have of old environments on earth. 3 sources: us apollo missions, soviet union missions (on land missions) and meterorites: crater impact on moon, enter earth"s gravitational field. 400 kg of rock have been brought back from the moon (basalt and anorphosite-similar to what makes up. Theory that moon originated from our planet by huge impact which detached part of our crust and mantle. The rock cycle: three main groups of rock: sedimentary (result of weathering and erosion of older rocks that produce sediments, loose sediments like clay, sand and boulders. They get deposited in sedimentary basins (lake ontario-sedimentary basin, hudson bay, atlantic ocean). They get buried and go through lithification (turn something into rock). Many environments that sediments are moved and deposited. Type of sedimentary: can tell ancient environment in which it was deposited in (like picture post cards).

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