EARTHSC 1100 Lecture Notes - Lecture 5: The Mantle, Seafloor Spreading, Gravitational Collapse
19 Sep 2018
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Know diagrams and things about them: for example: Is solid, but had portions like silly putty. Flow in liquid outer core forms earths magnetic field. Composed of liquid iron and nickel alloy. Thinner (~8km) and more dense (~3. 0 g/cm3) Thicker (~35 km) and less dense (~2. 75 g/cm3) inner core is solid. Composed of solid iron and nickel allot transfers heat into liquid inner core to initiate convection. 4 things to effect seafloor spreading: molten material, seafloor drill, radiometric age dating and fossil ages, magnetic stripes, copernicus published evidence for heliocentricity, galileo observed moons orbiting jupiter, newton planet motion was explained by his theory of gravity know scientists. Does not travel at the same speed and angle within the medium of the earth refracts and changes angel at which it travels. How the wave travels as going through different mediums travels through all parts. Portion of the earth where you cannot receive a wave.
