Geological Processes: Earth’s Formation, Evolution, and Plate Tectonics
ITEM 11: Dorsal Features and Plate Tectonics
Dorsal Features
Dorsal: 2/3 km seamounts on abyssal plain.
Failure: Fractures displaced laterally.
Ages
- Rocks on the ridges: Basalts 1 million years old.
- Aging on separating the dorsal: Increased every time we parted dorsal.
- Age-related power: Power and thickness increase away.
Lithosphere
The lithosphere is created at the ridges and spreads laterally. There are places where the lithosphere is reintroduced into the deep Earth (subduction zones). Volcanoes and
Read MoreEnvironmental Degradation in Spain: Causes, Impacts, and Solutions
Environmental Degradation in Spain
Introduction
The industrial and economic development, coupled with population growth in Spain, has led to significant environmental challenges. In recent years, there’s been a rise in ecological awareness among Spaniards, influenced by cultural and educational factors. This awareness highlights the degradation of the country’s natural resources and the need for legislation to protect remaining natural areas.
Soil Degradation
Soil degradation, including erosion, salinization,
Read MoreThe Dynamic Earth: A Comprehensive Guide to Geology
Summary of Geology
Theory of Plate Tectonics
The lithosphere is divided into plates that move under a layer with plastic characteristics called the asthenosphere.
Convection Currents in the Mantle
- Engine that generates currents: Earth’s internal heat
Types of Plate Boundaries
Convergent Boundaries
At convergent boundaries, there is destruction of the lithosphere. These boundaries are generally located in areas with trenches where the denser lithospheric plate subducts. For this reason, this area is also
Read MoreMetamorphic Rocks: Formation and Processes
Metamorphic Rock Formation
Metamorphic rocks originate from pre-existing rocks (sedimentary, igneous, or other metamorphic rocks) that undergo transformations due to changes in temperature, pressure, and/or chemically active fluids. Over time, sediments gradually sink and undergo diagenesis, transforming into sedimentary rock. With further sinking, increased pressure and temperature can induce melting and magmatism.
Metamorphism is an endogenous (internal) process, occurring independently of geographic
Read MoreEarth’s Surface: Relief and Geological Processes
1. Relief: Earth’s Surface Forms
Descriptive Classification (Appearance)
- Mountain: Isolated relief with a large gap between its base and top.
- Hill: Isolated relief with little gap.
- Gorge/Throat: Narrow valley bottom with steep walls.
- Plateau: Isolated relief with a flat top.
- Terraces: Phased relief.
Interpretative Classification (Process)
- Mountain: Relief that stands out from surrounding areas. A line of mountains is called a range. An erogenous mountain range is one formed by tectonic uplift.
- Monadnock/
Theories of Evolution and the Origin of Man
Theories of Evolution
Fixism vs. Evolutionism
Humans have always been curious about their origins. Understanding our past helps us understand our present and future. One theory is fixism, proposed by Georges Cuvier, which posits that all species are independent and unchanging since their creation. In contrast, evolutionism, gaining prominence in the 19th century, proposes that the universe and life are products of gradual development. Evolutionism had precursors in 18th-century transformism, championed
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