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

Environmental and Territorial Geography

Natural Disasters

Natural disasters occur when nature destroys as a result of the action of elements like relief, climate, and water, such as earthquakes, volcanoes, hurricanes, and floods. Example: Floods in Valencia.

Deforestation

Deforestation refers to forest loss resulting from the creation of new open spaces for agriculture and livestock. It is also caused by the construction of infrastructure, acid rain, desertification, and forest fires. Example: Deforestation in Serra de Na Burguesa, Mallorca, caused by forest fires.

Natural Area of Special Interest (ANEI)

A Natural Area of Special Interest is a space declared for its unique natural values of wildlife or landscapes. In the Balearic Islands, these areas... Continue reading "Key Concepts in Environmental and Political Geography" »

Solar System Theory

The Sun and the planets revolve in elliptical orbits. The planets are categorized into:

• Inner planets: Small, dense, and rocky with impact craters.
• Outer planets: Large, gaseous, and lighter.

Nebular Theory and Planetesimal Formation

The solar system began as a cloud of dust and gas. Gravitational collapse created a central mass and a rotating disc. The protosun formed at the center, eventually triggering nuclear fusion to become a star.

Formation of Protoplanets

Within the gas and dust disk, particles collided and fused to form granules, then clusters, and finally planetesimals. Through continuous collisions, these planetesimals merged to form protoplanets, clearing their respective orbital zones.

Formation of the Earth

The terrestrial... Continue reading "Solar System Formation and Big Bang Theory Explained" »

Economic Globalization and Major Institutions

International trade has grown significantly, leading to new production organization models, intensified international financial flows, and increased trade agreements between countries.

Key International Institutions

• World Bank: Aims to reduce poverty.
• IMF (International Monetary Fund): Advises governments on financial matters and provides loans to member countries.

Centers of the World Economy

Major Economic Powers

• United States: Represents over 20% of total world production. The US dollar remains the most important global currency.
• European Union: Stands as a leading economic power, though behind the United States in several aspects.
• East and Southeast Asia: Japan remains a wealthy nation. China has emerged

El Niño and La Niña Phenomena

Causes of El Niño

• Global warming, which reduces the thermal contrast between the two shores of the Pacific. This decreases the intensity of trade winds and ocean currents.
• Increased volcanic activity of oceanic ridges, which raises the temperature of the ocean.

When the trade wind subsides and does not blow westward, upwelling ceases. This leads to storms in the arid zones of Peru and Chile. The El Niño effect implies that fisheries production declines, and the global ocean temperature rises. Storms and rainfall increase in Peru, California, and East Africa, while droughts occur in Brazil and the Philippines.

La Niña

La Niña is characterized by an exaggeration of normal conditions. The trade winds blow harder,... Continue reading "Climate Dynamics: El Niño, Weather Risks, and Global Circulation" »

The landscape around us changes due to the action of external forces acting on its surface. The main energy source is solar energy.

Landscape Transformation by External Forces

The Role of Solar Energy

The amount of solar energy varies with latitude: the sun's rays do not strike all points of the Earth's surface in the same way. The energy received decreases as a function of latitude from the equatorial zones towards the poles, producing a thermal imbalance which is compensated by the flow of energy in the form of heat. This heat propagates through convective cells and is responsible for:

• Maintaining appropriate conditions for the development of life in the biosphere.
• Causing wind, clouds, rain, and snow, forming rivers, torrents, valleys, and glaciers.

Earth's Geological Foundations

Understanding Rocks

Igneous Rocks

Igneous rocks are formed when magma solidifies.

Magma Defined

Magma is a mixture of molten rock and gases.

Metamorphic Rock Classification

Metamorphic rocks are classified, often exhibiting laminar (layered) or crystalline structures.

The Rock Cycle Explained

The rock cycle is the set of processes experienced by rocks and sediments at the surface and inside the Earth's crust.

Uses of Rocks

• Building materials
• Ornamental purposes
• Containers
• Fuel
• Chemical industry

Minerals and Their Properties

Minerals: Definition and Features

Solid minerals are formed by the chemical combination of elements in the Earth's crust. Rocks are composed of minerals, which possess three key features:

• Being natural
• Having

Concrete Components

• Concrete Components

• Fine Aggregate Cement
• Coarse Aggregate
• Water
• Additives

These are substances or products incorporated into the concrete before or during mixing at a rate not exceeding 5% of the fresh concrete and/or to modify some of its characteristics, common properties, or behavior.

Common additives include water reducers, superplasticizers or plasticizers, retarders or accelerators for curing, air-entraining agents, dyes, and air occluders for frost resistance, etc.

• Additions

These are inorganic materials, pozzolanic or latent hydraulic, finely divided, that can be added to concrete to improve some of its properties or confer special properties.

An example includes the use of fly ash as an addenda. Fly ash is obtained by electrostatic... Continue reading "Concrete Composition: Materials, Dosage, and Properties" »

Environmental Impacts and Pollution

Atmospheric Pollution

Environmental contamination results from the introduction of foreign materials into the environment, or the presence of existing materials at concentrations exceeding normal values.

These foreign materials are often caused by contaminating agents and substances.

Atmospheric Contaminants and Control

The most common and widely dispersed air pollutants are described below. Their levels are usually expressed in terms of atmospheric concentration or, in the case of gases, in parts per million air molecules.

Among the air pollutants emitted by natural sources, there is radon, a radioactive gas harmful to human health.

Some contaminants are formed, for example, by the action of the sun on previously... Continue reading "Understanding Environmental Pollution and Resource Scarcity" »

3D Sculpture Transfer System

The 3D transfer system applies a process to create an exact copy of a sculpture by setting reference points, average diameters, and minimum measurements. It translates three-dimensional sculpture measurements without damaging wood, stone, or clay by measuring the height, width, and depth of the piece. Its basic tools are squares, set squares, compasses, and a pointing machine. The most commonly used techniques are the pointing system and the compass method.

Geometric Solids

Geometric solids are objects that occupy a volume in space, developing in three dimensions (height, width, and length), and are composed of geometric figures (polygons). The lines that correspond to the common sides of the various planes of geometric

Key Earth Science and Weather Terms Defined

Acid Rain

Rainwater containing chemicals that result from the burning of fossil fuels.

Altitude

The height of a place above sea level.

Anticyclone

An area of high pressure usually associated with fine, settled weather.

Climate

The average weather conditions of a place over many years.

Condensation

The process by which water vapor changes to a liquid or a solid when cooled.

Continental Crust

A part of the thin outer layer of the Earth that is relatively light, so it cannot sink and cannot be destroyed.

Depression

An area of low pressure usually associated with clouds, rain, and strong winds.

Dew Point

The temperature at which moist air becomes saturated.

Drought

A prolonged period of weather that is drier than usual.... Continue reading "Essential Earth Science & Weather Terms Glossary" »