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

Natural Resources and Their Classification

Natural resources are the total quantities and amounts of materials found in the soil that can have an economic value. These resources can be classified into renewable and non-renewable categories.

Types of Resources

• Non-renewable: Their formation has been a long and complex process. Once exhausted, they disappear (e.g., minerals and fossil fuels).
• Renewable: These can be replaced while they are consumed. However, it should be noted that human and plant species, once extinct, are not recovered.

Principal Natural Resources

• Air as a resource: It is a fundamental resource for mankind and the rest of the organisms. The main problem facing this resource is air pollution.
• Soil: This is the support for all forestry,

Essential Definitions in Urban Geography

• Isochronous Urban Lines

  Lines that connect points of the city or its surroundings, from which the time taken to reach the urban center is the same.

• Urban Isoprice Lines (Isoprecios)

  Lines that connect various parts of the city or its surroundings, from which the travel cost to the city center is the same, assuming a system without specific fees and multipurpose transport.

• Urban Hierarchy

  Classification of cities according to their order of importance. This hierarchy can be measured in terms of:

  • Demographics: Population size.
  • Economic factors: Production parameters quantified in Gross Value Added (GVA).
  • Commercial factors: Market share.
  • Directional factors: Advanced services.
  • Polyfunctional factors: Nelson rates

Sustainable Development

According to the Brundtland report, where this term first appeared, sustainable development is "development that meets the needs of the present without compromising the ability of future generations to meet their own needs." This requires a respectful attitude towards all people, all living beings, and all ecosystems.

This involves:

1. Consuming resources below their regeneration capacity.
2. Disposing of waste in quantities that nature can absorb.
3. Utilizing renewable energy sources.
4. Ensuring development reaches the entire population.

Sustainable development has three components: economic growth, environmental conservation, and social equity. It's important not to confuse the concepts of growth and development. Economic growth refers... Continue reading "Sustainable Development, Atmosphere, and Pollution" »

Parthenon: An Architectural Marvel

I observe the front, main elevation, facade, or side elevations of a structure. The primary material used in this construction is marble. A significant portion of the outer space is visible, along with a part of the building's interior. The structure rests upon a base (crepidoma) with steps (crepis) extending along its entire perimeter.

Structural Elements

The load-bearing elements include walls and columns. Where visible, the wall presents meticulously matched stones, indicating a regular ashlar construction. The columns do not directly rest on the stylobate. The shaft features sharp edges or ridges, separated by grooves. The capital comprises an abacus, echinus, and collarino.

Supporting elements include the... Continue reading "Parthenon & Maison Carrée: Ancient Greek Temples" »

Materials in a Building

Structure

The strong skeleton of the building, consisting of:

• Cimientos (Foundations)
• Pillars
• Vigas (Beams)
• Forjado (Slab/Flooring)

They can be made of concrete, reinforced concrete, or steel.

Siding

Serves as external protection against atmospheric agents. Consists of: facade walls and the roof structure (steel support on which the roof is constituted).

Partitions

Internal walls or divisions that sort and distribute the interior space. Typically made of bricks and plaster.

Coatings

Applied to floors, walls, and ceilings to provide a finished surface. Consist of materials such as paint or fabrics.

Types of Rocks

Magmatic or Igneous Rocks

Formed by the solidification of molten material from inside the Earth, e.g., Granite.

Sedimentary

Flow: l/min, m³/h. Pressure: 1 bar = 10⁵ = 1 atm = Pascal = 1 kp/cm². Absolute pressure: Real pressure, including atmospheric pressure. Relative or differential pressure: This takes into account the atmospheric pressure. Temperature: K = 273 ° + °C. Performance: Utilization relationship between the magnitude and extent consumed, expressed in %. Boyle's Law - Mariotte: The volume occupied by a mass of gas at constant temperature is inversely proportional to the supporting pressure. Charles's Law: The volumes occupied by a mass of gas at constant pressure are directly proportional to temperature variations. Gay-Lussac's Law: At constant volume, the pressure of a gas is directly proportional to temperature variations. Combined or General Law:

Precision Measuring and Comparing Tools

• Metro: This may be collapsible or flexible. It is used to measure medium-sized and large objects, though sometimes inaccurately.
• Caliper (Size): A device widely used for small and medium-sized measurements, including exterior, interior, and depth.
• Goniometer: A rule that moves on a pivot, used specifically to measure angles.
• Micrometer: Ideal for small external and internal measurements requiring high precision.
• Clock Comparator: Allows for the testing of surface finishes and eccentricities through the relative comparison of two surfaces.
• Depth Micrometer: Features an axis to determine the depth of a piece with a precision estimated at one-hundredth of a millimeter.
• Diabase Marble: Used to check surfaces and

The El Niño and La Niña Phenomena

The normal situation along Peru's coast involves trade winds pushing surface water westward across the Pacific, leading to the upwelling of nutrient-rich water and fertilization of the area. These winds originate from an anticyclone located over Easter Island and dissipate near the Asian continent.

Understanding El Niño

The El Niño phenomenon is characterized by the excessive heating of the surface waters in the eastern Pacific. It typically occurs every 3-5 years and lasts approximately 18 months. This event happens when trade winds subside, allowing the surface water to heat up and form a storm system.

Understanding La Niña

La Niña is considered an exaggeration of the normal situation, occurring when trade... Continue reading "Understanding El Niño, La Niña, and Frontal Precipitation" »

The geological cycle describes the changes Earth's surface undergoes over time. These changes are driven by two main agents: internal forces (related to Earth's heat and relief) and external geological forces (processing relief through solar energy and gravity).

External Geological Agents

Atmosphere

The atmosphere directly acts on rocks through chemical weathering and mechanical processes.

Water

Water plays a crucial role in several ways: as surface water, underground water, ice, and seawater.

Wind

Wind, powered by wind energy, is a significant agent in areas with little to no vegetation.

Factors Determining External Geological Agents' Impact

Several factors influence how external geological agents wear down the Earth's surface:

• Climate: The presence

Soil Formation Factors

Parent Rock (Roca Madre): This is the mineral substrate from which soil is formed. It affects its color, texture, structure, permeability, and acidity.

Climate: This is the most influential factor. Temperatures affect chemical and biological processes, while rainfall conditions the leaching process.

Topography: Heavy soils accumulate in flat areas, while steep slopes lead to erosion and soil slippage.

Living Beings: These act in various ways. Various plants may acidify the soil, impoverish it, or enrich it by providing a base or picking up nutrients through their roots.

Time: This is a determinant factor, since the formation of a soil is a slow process that requires centuries.

Soil Horizons and Profiles

Soils are made of horizons... Continue reading "Soil Formation Factors and Altitudinal Vegetation" »