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

Divergent Boundaries

This occurs when a stream of magma rises to encounter a plate, breaking it up and separating it into two fragments.

Convergent Boundaries

These occur when two plates collide against each other.

Oceanic and Continental Plates

The oceanic plate sinks beneath the continental plate in a process called subduction.

Continental Plates

If two continental plates collide, they form intracontinental mountain ranges.

Two Oceanic Plates

When two oceanic plates collide, subduction occurs, with one sliding below the other to form a volcanic island arc.

Transform Boundaries

Plates slide laterally without climbing over one another, causing the formation of large faults.

Deformations and Scales

• Mesotectonics: Structures between 1m and 1km in length.
• Macrotectonics:

This document outlines various types of cement, detailing their composition, properties, and specific applications. Understanding these distinctions is crucial for selecting the appropriate cement for diverse construction needs.

BL: White Cement

BL White Cement is produced through a collection process involving special low-clinker content, iron, and specific additions, followed by milling. The additions used in its production do not alter its whiteness indices.

BC: Cement with Low Heat of Hydration

BC Cement is characterized by its low heat of hydration. Its production involves a special clinker (obtained with moderate contents of AC and SC3 and moderate fineness of grind), along with other major and minor components. This is followed by additions... Continue reading "Understanding Key Cement Varieties and Their Properties" »

Big Bang Theory

Big bang theory:

1. Both matter and energy in space were concentrated in one point called the primeval atom, whose density and temperature must have been very high.
2. The primordial atom then expanded rapidly in a large explosion or "Big Bang" and began the expansion that generated the universe.
3. Subatomic particles formed first, and later the simplest atoms, hydrogen and then helium, were produced.
4. Temperatures fell and then formed the nebulae, galaxies, stars, planets, etc. In the stars chemical processes created the elements.

The elements appeared and different planets of the solar system formed: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Formation of the Solar System

On the formation of the solar system: The Sun... Continue reading "Big Bang, Solar System Formation and Earth's Structure" »

The Big Bang and the History of the Universe

1. Stage of Inflation: The super-compressed universe expanded during the Big Bang. At an enormous speed, the universe grew during the stage of inflation.
2. Formation of Matter: The universe was composed of subatomic particles and immense amounts of energy in the form of photons. When it cooled to a billion degrees, neutrons and protons formed.
3. The First Atoms: Some 300,000 years after the Big Bang, hydrogen and helium atoms formed in percentages similar to those found today.
4. The Power of the Universe: Charged particles (protons and electrons) interfered with photons. But once they combined with each other to form atoms, light could travel freely in the newly created space.
5. Formation of Stars and Galaxies:

Essential Economic and Tourism Definitions

Understanding specialized terminology is crucial for analyzing regional economies and the global tourism sector. Below are definitions of key concepts relevant to international trade, regional development, and hospitality management.

Balance of Payments Definition

The Balance of Payments (BOP) is an accounting document that records all economic transactions between a country and the rest of the world during a specific period. Example: The balance of payments of Spain.

Balearization: Economic Model and Coastal Impact

Balearization refers to the characteristics and organization of a regional economic model (often associated with the Balearic Islands) characterized by structural imbalance and unsustainable... Continue reading "Key Economic and Tourism Terminology Defined" »

Low-Level Clouds

• Cumulus (Cu): Clouds that have a substantially horizontal base, well-defined contours, and a white color when illuminated by the sun. They cause rain in the form of showers and consist mainly of water droplets, though they may contain ice crystals at the top. Variations: humilis (vertical development), mediocris (rounded top), and fractocumulus (fragmented due to turbulence).
• Congestus: Features protruding edges on top and considerable vertical extent. It indicates profound instability and is favored by cyclonic flow at altitude.
• Cumulonimbus (Cb): A cloud with great vertical development in the form of a mountain, often only visible from afar due to its size. The top usually has a characteristic anvil shape. It is a darker cloud

Soil Degradation Factors

• Physical: Deterioration occurs due to the breakdown of natural soil structure and porosity.
• Chemical: Degradation happens as crops extract essential minerals from the soil.

Manure Application (Enguanado)

The enguanado process involves incorporating manure into the soil. Common sources include chicken manure for vegetables and goat manure for fruit crops.

Application Rates

Standard application doses typically range between 5 and 15 tons per hectare. Manure is generally applied in a rotation cycle of every 3 to 4 years.

Green Manures

Green manures were introduced as traditional guano supplies dwindled. This method involves adding organic matter derived from annual herbaceous plants, grasses, and legumes.

Vegetable Fertilization

Because... Continue reading "Soil Management and Conservation Techniques for Agriculture" »

Risk Assessment Fundamentals

The risk of an event (R) is calculated by multiplying the hazard (P) by the exposure (E) and vulnerability (V), expressed in per unit. The formula is: R = PEV.

Hazard

This is the probability of occurrence of a potentially damaging event in a specific region and at a determined point. Various factors influence hazard, such as the geographic distribution of the event, the surface area, or the return time. The different degrees of risk of an event in a given area are represented on maps called hazard maps.

Exposure

Exposure refers to the total number of people (social exposure), or the total amount of assets (economic exposure), or areas of high ecological value, which can be affected by an event. Similarly, maps are developed... Continue reading "Risk Management & Environmental Impact Analysis" »

The Hydrosphere

The hydrosphere is the layer formed by all the water on the surface of our planet.

Water Properties

Water exists in solid, liquid, and gas states on the Earth's surface.

• Water is a universal solvent.
• Water has a high heat capacity.
• Water is less dense in its solid state than in its liquid state.

Dissolved Substances in the Hydrosphere

These include various minerals and gases.

Mineral Salts

Water comes into contact with rocks containing soluble minerals. Key minerals include:

• Sodium: Usually found in compounds such as sodium chloride (NaCl). It is essential for the human nervous system.
• Potassium: Part of potassium chloride (KCl), found in seawater. The nervous system requires potassium to function properly.
• Chlorine: Found in common salt

The Isabel II System Crisis (1856-1868)

The last stage was dominated by the return of the Moderate Party to power and its alternation with the Liberal Union. The Moderate Party had gained international prestige with colonial pretensions. Internally, the action of the government was very authoritarian, acting outside of the courts and exercising strong repression against political groups. Opposition to the regime was growing, and new political groups emerged, such as the Democrats, who defended universal suffrage, and the Republicans, who advocated the abolition of the monarchy.

The Revolution of 1868

The political and economic crisis triggered the first revolution against the monarchy. The Unionists, Progressives, and Democrats joined forces to... Continue reading "Spain's Political Turmoil: 1856-1898" »