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4: Earth’s Interior Processes

Last updated

Apr 1, 2025
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- 3.3: Metamorphic Rocks
- 4.1: Earth’s Interior

Lumen Learning
Lumen Learning

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4.1: Earth’s Interior
This page explains the Earth's interior, which has three layers: the thin, brittle crust, the hot solid mantle, and the iron-nickel core, composed of a liquid outer core and solid inner core. Scientists use seismic waves from earthquakes to study these layers, as drilling has only reached the crust. Convective currents in the mantle and outer core are essential for geological processes and the generation of Earth's magnetic field.
4.2: Plate Tectonics
This page details plate tectonics, explaining Earth's lithosphere movement and its impact on earthquakes and volcanoes. It discusses Alfred Wegener's continental drift theory, evidence supporting it, and the mechanism of seafloor spreading. The text describes types of tectonic plate boundaries: divergent (mid-ocean ridges), convergent (subduction and mountain formation), and transform (like the San Andreas Fault).
4.3: Volcanoes
This page discusses volcanoes, primarily located at convergent and divergent plate boundaries, particularly around the Pacific Ocean's Ring of Fire. Eruptions result from melting mantle rock and vary based on magma composition, impacting the environment. They can be effusive or explosive, with supervolcanoes like Yellowstone posing significant threats.
4.4: Earthquakes
This page explores the interactions between plate tectonics, earthquakes, and geological activity. It details the types of tectonic stress, the mechanisms behind earthquakes at different plate boundaries, and emphasizes the significance of fault lines and seismic waves. Notable earthquakes are mentioned to illustrate these concepts. The text underscores the importance of construction quality and preparedness measures to minimize damage and fatalities in earthquake-prone areas.

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