Notes, summaries, assignments, exams, and problems for Geology

1. The Destruction of Forest Cover

Economic development in Spain between 1960 and 1973 occurred at the expense of large industrial concentrations and the abandonment of rural areas. This marginalized certain regions, resulting in severe environmental degradation. Today, there is significant civic and political awareness regarding environmental issues, leading to the establishment of the Ministry of the Environment in 1996.

Major Environmental Challenges

The most serious problems are not solely due to human action, but include:

• Process of soil erosion and desertification.
• Contamination of groundwater, surface water, and marine environments.
• Unprevented natural disaster risks.
• Soil contamination or depletion due to overexploitation and toxic dumping.

Chapter 8 – Earthquakes

What is the elastic rebound theory? Is it possible for energy building up in the lithosphere to be released in a sequence of earthquakes?

Rocks “spring back” – a phenomenon called elastic rebound

Energy is released in a sequence of earthquakes (one earthquake can trigger slip on a nearby fault)

What is a seismic body wave, and what characterizes each of the two types of body waves (i.e. type of motion, velocity)?

1. Primary(P) waves(spring)=push&pull motion, greatest velocity, arrive first, travel solid, liquid, gases.
2. Secondary(S) waves (rope)=up&down motion, slower velocity, arrive after P at seismograph, travel only solid.

What is a seismic surface wave, and what characterizes each of the two types of surface

Adipocere Formation Over Time

On Earth, over time, adipocere undergoes certain changes that allow us to distinguish between recent (or young) adipocere and old adipocere. Recent adipocere may show little uniformity and thickness on portions of foreign tissues (remains of muscles, tendons, or ligaments). Old adipocere is hard, dry, and somewhat brittle; its structure is more homogeneous.

Conditions for Saponification

Environmental Conditions

Circumstances that favor adipocere formation include:

1. When the corpse has been submerged in water or in an area of low current.
2. When the corpse has been buried in damp clay soil.
3. When many bodies have been buried in contact with each other: the bodies in the lower layers tend to saponify to a greater or lesser

Introduction to Al-Andalus

In 711, most of the territory of the Iberian Peninsula was conquered by Muslims, initiating a long period of confrontation between Muslims and Christians.

Formation of Muslim Al-Andalus

In 711, Arab troops and North African Berbers crossed the Strait of Gibraltar. They were directed by Tariq and Musa, lieutenant of the Muslim governor of North Africa. Internal conflicts within the Visigothic kingdom in the peninsula made the easy defeat of King Roderic possible. The Muslims exploited this to encourage their expansion across the peninsula.

Areas outside Muslim control were reduced to nuclei of resistance in the Cantabrian mountain range and the Pyrenees. These resistance nuclei became kingdoms that confronted the Muslims... Continue reading "History of Al-Andalus: Conquest, Society, and Culture" »

1 - The Deciduous Forest

It consists of tall trees with straight trunks, smooth bark, and large leaves that fall in autumn. This forest type has relatively few species, often forming large masses. The most common features are Carballo oak and beech. In the understory, ferns and mosses thrive in a somber mood created by the treetops.

2 - The Heath and Grasslands

The Landa is a dense shrubland, whose height can be low or reach 4 feet. Its most abundant species are heather, gorse, and broom. The heath is considered a form of deciduous forest degradation or supraforestal vegetation. It is often used for animal bedding and then as fertilizer.

The meadows are herbaceous vegetation occupying large tracts of land with ocean views.

The Vegetation of the

Plate Tectonics: Key Concepts

• Biological Puzzles

  The existence of land bridges or island chains that connected the ancient continents.

• Geographic Enigmas

  The outer edge of the continent is under the sea where the continental shelf terminates.

• Geological Riddles

  There is a correspondence between geological structures present on both sides of the Atlantic Ocean.

Scenarios of Continental Drift

According to Wegener, all continents were part of a large landmass (supercontinent called Pangea).

• Paleomagnetic Tests

  During the cooling of lava, ferrous minerals align. Studying these minerals indicates the position of the north pole.

• Oceanographic Evidence

  The discovery of the oceanic ridge system that splits the great oceans.

• Seafloor Spreading Hypothesis

  Harry Hess

Earthquakes

Earthquakes are caused by vibrations resulting from movements or fractures within the Earth's crust.

• Hypocenter (Seismic Focus): The specific location where the fracture occurs.
• Epicenter: The point on the Earth's surface directly above the hypocenter, where the earthquake is first perceived.
• Seismic Waves: The vibrations generated by the event.
• Richter Scale: Measures the intensity of an earthquake. Each level represents a 10-fold increase in energy released at the hypocenter.

Seismic Waves and Earth Structure

Seismic waves allow scientists to study the Earth's interior and predict potential earthquakes or tsunamis.

Layers and Plates

The mantle is composed of peridotite. There are two primary types of crust:

• Continental Crust: Abundant in

Chapter 5 - River Systems

How rivers and streams work – Gradient (know this!)

• Streamflow
  • Factors that determine velocity
  • Gradient, or slope
  • Channel characteristics
    • Shape
    • Size
    • Roughness
    • Discharge – volume of water flowing in the stream (generally expressed as cubic feet per second)
• Gradient highest nearest river source, where is it lowest?
• Upstream-downstream changes
  • Profile
  • Cross-sectional view of a stream
  • From head (source) to mouth
  • Profile is a smooth curve
  • Gradient decreases from the head to the mouth
  • Factors that increase downstream
    • Velocity
    • Discharge

Base level

Rivers flow and/or erode to the lowest level, ultimately to sea level

• Base level
  • Lowest point a stream can erode to
  • Two general types
    • Ultimate – sea level
    • Temporary, or local
  • Changing causes readjustment

Atmospheric Layers and Structure

The Troposphere

The troposphere concentrates the bulk of the atmosphere's mass and all moisture and dust particles. It extends up to 16 km in Ecuador and a minimum of 8 km at the poles. It is where all weather phenomena, such as wind and rain, develop.

The Ionosphere

Situated between 90 and 400 km, the ionosphere is ionized and reflects radio waves.

Environmental Impact Assessment

Declaration of Environmental Impact (EID)

Communication is required by law regarding predicted environmental consequences, and should include the following:

• Project description.
• Consideration of alternatives to actions that are performed.
• Environmental inventory prior to completion of the activity.
• Identification of anticipated impacts.
• Protective

Understanding Natural Resources

In human terms, a resource is anything we obtain from the environment to satisfy our needs and desires. All living things require basic resources such as food, water, and shelter. Some resources are directly usable, while others require effort or technology to become useful.

Types of Natural Resources

Perpetual Resources

These resources are virtually inexhaustible on human timescales. Examples include direct and indirect solar energy (wind, running water).

Non-Renewable Resources

Non-renewable resources exist in a fixed amount within the Earth's crust. They may form through natural processes, but over millions or billions of years (e.g., oil takes 600 million years to form). While complete exhaustion is rare, economic... Continue reading "Understanding Natural Resources: Types, Sustainability, and Challenges" »