Astronomy 1021 Chapter Notes - Chapter 7: Solar Wind, Outer Core, Electromagnet
16 Dec 2017
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Document Summary
The earth"s surface is very changeable from earthquakes to volcanoes to asteroids to rivers. All the terrestrial planets would have looked similar at their creation: differences must be due to changes. Why is earth geologically active: this means earth"s surface is continually being reshaped by volcanic eruptions, earthquakes, erosion, etc, interior structure. Seismic waves: vibrations that travel both through and on the surface after an earthquake. Core: highest density material, consisting primarily of metals (such as nickel and iron) residing in a central core. Mantle: rocky material of moderate density (mostly minerals such as silicon and oxygen) forms a thick mantle that surrounds the core. The very top of the mantle is called the lithosphere". It is a cool and rigid rock that essentially floats on warmer softer rock beneath. Granite and basalt (common form of volcanic rock)) forms a thin crust. Earth"s core consists of a solid inner core and molten outer core.
