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

Understanding Environmental Pollution

Pollution is defined as an increase in harmful substances or the excessive addition of energy into the natural environment. Contamination directly affects both the biological activity and the survival of living organisms, including human beings.

Chemical and Physical Contamination

Pollution types are classified according to the natural medium they affect: air, soil, or groundwater.

• Chemical contamination: The presence of unusual or foreign chemical compounds in the environment.
• Physical contamination: Undesirable changes in the physical characteristics of the atmosphere, soil, or water.

Factors in Atmospheric Pollution

Atmospheric contamination (air pollution) has become a severe problem that not only compromises... Continue reading "Environmental Pollution, Greenhouse Effect, and Ozone Layer" »

Mètodes d'Estudi i Estructura Interna de la Terra

Mètodes directes: Estudi de les mostres de materials obtingudes mitjançant perforacions.

Mètodes indirectes: Són útils en l'anàlisi de les característiques del nostre planeta.

• Radi de la Terra: 6371 km
• Escorça: 30 km

Discontinuitats Sísmiques

Una discontinuïtat és una zona de contacte entre dues capes de la geosfera. Les ones sísmiques, en travessar el mantell i les discontinuïtats, canvien de trajectòria.

• Discontinuïtat de 1r grau: Es produeix un canvi brusc de les propietats entre dues capes. Inclou la de Mohorovicic (entre l'escorça i el mantell) i la de Gutenberg (entre el mantell i el nucli).
• Discontinuïtat de 2n grau: Canvi gradual entre dues capes. Inclou la de Repetti (entre

Earth and Geographic Features

Circles perpendicular and parallel to the terrestrial axis are parallel. Ecuador, at 0 degrees, is a semicircle. Meridians go from pole to pole. Meridian 0 degrees passes through Greenwich.

Latitude and Longitude

Latitude is the angular distance from any point of land to Ecuador. Longitude represents the distance from meridian 0.

Maps and Relief

A map proportionally represents land or a part of it. Geography is the science that studies landscapes, understood as a set of physical and human elements that relate to each other.

Relief is the set of forms that the Earth's surface presents, shaped by terrestrial forces.

Morphostructural Units

Organic and erosive forms are the internal disposition that relief takes. Erosion is... Continue reading "Earth Science: Landforms, Climate, and Water Flow" »

Metals and Materials: Properties, Extraction, and Uses

Tin (Sn)

Tin is obtained from cassiterite (SnO₂). It has a bright, pure color and malleability, and it is very soft and fragile when hot. At -18 °C it becomes brittle, and when bent it produces a cracking sound known as the "cry of tin."

Alloys: bronze, soft solder, and low melting point alloys.

Extraction process:

• Crushing and grinding in mills
• Concentration of the ore by flotation
• Oxidation in a furnace to remove impurities
• Reduction of the metal in a furnace to obtain tin of 99% purity

Aluminum (Al)

Aluminum is obtained from bauxite. It has very good resistance to air and stainless properties. It is a good conductor of electricity and heat, malleable, and very ductile.

Bayer process:

1. The bauxite

Eukaryotic Cells

Eukaryotic cells have a defined nucleus and various membrane-bound organelles.

Animal and Plant Cells

In animal cells, there are centrioles arranged in cylinders, also called centrosomes. In plant cells, there is a cell wall that protects the cell. Plant cells also have plasmodesmata, channels that connect one cell to another, and tend to contain large vacuoles and chloroplasts.

Cell Components

Nucleus

The nuclear envelope is a double membrane separated by an intermembrane space. Both membranes are crossed by nuclear pores.

• Nucleoplasm: an aqueous medium in which the nuclear components, such as DNA, are immersed.
• Nucleolus: a spherical body lacking a membrane. It can only be seen when the cell is not dividing.
• Chromatin: made up of

Essential Geological Terms: Tectonics and Landforms

Orogeny or Orogenic Movement

A set of geological processes that cause the formation and folding of mountain ranges.

Ancient Massif (Old Massif)

Mountainous terrain formed by crystalline and metamorphic materials from the Primary Era (Paleozoic or Precambrian). It exhibits rigid behavior against internal Earth forces, tending to fracture rather than fold under tectonic thrusts.

Peneplain

A large landform, gently undulating and characterized by a low slope. It results from a long cycle of erosion during periods of tectonic calm, leading to widespread leveling of the relief.

Tectonic Style (Structural Form)

A set of characteristics defining a tectonic structure and the mechanisms causing its deformation.... Continue reading "Essential Geological Terms: Tectonics, Landforms, and Earth Structure" »

1. Origins of Globalization

Centuries ago, lands were isolated, and countries were separated from one another. This situation changed irreversibly in the late 19th century when European countries initiated the era of discovery, which opened the modern world. As a result of this process, lands in different regions were integrated into a unique market of global dimensions, organized by colonial powers according to their historical interests. This development is known as globalization.

The Current Phase of Globalization

This is the latest and most intense phase of the globalization process, which began with the discoveries and gained strong momentum during the Industrial Revolution.

Causes of Globalization

• Economic: The capitalist system has been profoundly

The Crisis in Rural Areas

The crisis manifests itself in two key indicators: a decrease in the active population employed in the sector and a reduction in its contribution to GDP, currently around 3%. However, it is important to note that agricultural GDP grew in absolute terms. This situation has led to a reduced participation of the agrarian sector in external trade relations with the other two sectors. The trade balance showed a deficit between 1970 and 1995. This deficit was caused by an increase in food imports, related to a rising standard of living, and imports of tropical and timber products.

Principal Challenges Facing Rural Spain

The principal problems facing rural Spain are as follows:

Demographic Issues

• Population Decline and Aging:

The Cell: Discovery and Fundamental Theory

Key Discoveries in Cell Biology

The journey into understanding cells began with groundbreaking observations:

• Robert Hooke, using a simple microscope he built, observed and described "cells" in cork in 1665.
• In 1674, Anton van Leeuwenhoek was the first to observe and describe living cells and microorganisms in water, which he called "animalcules."
• The botanist Robert Brown discovered a corpuscle inside plant cells in 1831, which he named the nucleus.
• The medical term "protoplasm" was introduced by Johannes Purkinje in 1839 to designate the liquid substance that fills the cell, essential for its health and integrity.

The Cell Theory

In 1838-1839, the botanist Matthias Schleiden and zoologist Theodor Schwann... Continue reading "Cell Biology Fundamentals: Structure, Discovery, and Organelles" »

Judo Penalties and Infractions

Similarly, there exists a system of scores and actions that are valid. There are other penalizations or infractions that are called judoka rules.

Terms and their meaning:

• Hansoku-make: is equivalent to the first action itself, the disqualification of the judoka. The penalized competitor is disqualified with 10 points, which means the opponent receives an ippon to conclude the match.
• Kikoku: penalties with kikoku are given for serious faults, and presuppose the first advertence with a penalization of 7 points. In the same way, one waza-ari is conceded to the opponent.
• Shido: a shido action is penalized with the first warning, which must be noticed by the arbitrator. It is equivalent to 5 points or one yuko conceded