ERS120H5 Lecture 2: LEC #2 (Formation and Structure of the Planet)
16 Feb 2017
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Lecture #2 formation and structure of the planet. Oldest dated rocks on the earth: 4. 03 billion years. Oldest dated minerals on earth: 4. 35 billion years. Oldest meteorites: 4. 57 billion years (amalgamated pellets of protodust from the earliest formation of the solar system) Top hat: order the following events from oldest to most recent. Explosion from an infinitesimally small point, producing irregular distribution of. Stars form and explode in several cycles. A nebula forms from hydrogen and helium and heavier elements left from the big bang, and previous star cycles. Soon after earth forms, a small planet collides: the moon forms from the ring of debris. Answer: the pressure of the earth near the inner core keeps the layer solid as opposed to liquid like where the outer core is. Crust: 0. 5% of volume, 7-70 km thick. Mantle: 67% of volume, 2885 km thick. Outer core: 30. 8% of volume, 2255 km thick. Inner core: 1. 7% of volume, 1216 km thick.
