NATS 1750 Lecture Notes - Lecture 2: Table Tennis, Continental Crust, Magma Chamber
26 Oct 2016
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Document Summary
Extrusive if gets to surface; intrusive if harden at bottom. There are situations which they produce economic resource. Batholiths: magma chamber, erosion will bring to surface. Volcanoes exposed to environment so they will erode away quickly. Magma pushed through cracks and never reaches the surface. When it doesn"t reach surface, hardens in cracks and will hardening called. Dykes cut across right existent layers, pushes through weak spots but angles dykes/sills to existing rock. Where laying around each other, one layer soft. Force through beds, can see sills lay bedding pane. Laccoliths: finds weak spot in rock and fills it up. Form a bubble of magma under surface. Centre of earth is hot, similar to surface of sun. Outer core is liquid, can flow, spins produces magnetic field called dynamo. Changes time as cord tends to vary. Undergo changes, magnetic field is not static. Water at bottom heated, rises it cools and sinks (confection) Core is hot, top layers are cooler.
