Notes, summaries, assignments, exams, and exercises for Geology for Baccalaureate

Agricultural Activity in the Basque Country

Agricultural activity in the Basque Country is currently experiencing a decline due to the modernization of industrial demand. The primary agricultural population is decreasing significantly. In the Cantabrian region, however, activity remains stable due to successful modernization, and the topography facilitates mechanization.

The Atlantic Rural Zone

The Atlantic zone comprises lands north of the divide, including Bizkaia, Gipuzkoa, Álava, Navarre, and the Basque Continental region. This area is characterized by:

• Relief and Climate: Accidental terrain, a humid climate with regular rainfall, and poor soil quality.
• Agrarian Structure: Low rural population density due to historical exodus.
• Holdings System:

The Historical Evolution of Spanish Urban Centers

The Early Medieval and Islamic City

The appearance of the barbarians during the early Middle Ages provoked the ruralization of the population, a societal shift that extended until the entrance of the millennium.

The Islamic City (Al-Andalus)

The Islamic city was a prominent urban center during the Spanish Middle Ages. Cities under Muslim rule were able to maintain important commercial activity, which is clearly reflected in their urban layout.

• These were unplanned cities, characterized by mazes of streets and alleyways with barely open spaces.
• They featured an irregular plan, centered on a walled core where the mosque and the zoco (market) stood.

The Christian Medieval City

The commercial development...

Natural Resources and Environmental Impact

Natural resources: Assets that are derived from nature and meet human needs.

Environmental impact: The effect of a particular human activity on the environment. The concept can be extended to the effects of a natural phenomenon.

Environmental Risk: The possibility of an event occurring in order to produce a catastrophic impact on the natural or social environment.

Resource Classification and Sustainability

Renewable resources: These are resources that, with proper treatment, can maintain or even increase their amount. Always available, renewables are the main resources of biological origin.

Nonrenewable resources: These are those existing in a given quantity where exploitation can eventually exhaust them....

Atmospheric Pollution

The combustion of hydrocarbons, largely due to industrial processes or transportation, generates smoke, suspended particulates, and gaseous pollutants. The most common are carbon monoxide, carbon dioxide, sulfur oxides, nitrogen oxides, and hydrogen sulfide.

Industrial facilities and power plants usually emit a greater volume of contaminants. In the developed world, the danger of some issues has forced the relocation of industries to industrial belts outside of densely populated urban areas. However, emissions are still causing serious environmental problems.

Acid Rain and Smog

Emissions of sulfur and nitrogen react in the atmosphere when in contact with oxygen, water vapor, and light, producing mainly sulfuric acid and nitric...

Loss of Colonial Rule and the Crisis of 1898

International Historical Context

Restoration Spain coincided with a period of peace during the last third of the 19th century. While European nations experienced industrial revolutions, England and France boosted their imperialist ambitions. The United States turned its attention toward the final Spanish colonies. This golden age of imperialism occurred between 1870 and 1914, a time when Spain was a weak, internationally isolated nation, leading to the crisis of 1898.

Causes of the Cuban War

• Spain failed to fulfill the agreements of the Peace of Zanjón.
• The rejection of the 1893 project proposing Cuban autonomy by Maura.
• Cuba received constant support from the United States starting in 1891.
• The U.S. supported

Climate Feedbacks and Their Impact on Climate Change

Feedbacks within the climate system amplify climate changes initially caused by external factors. This can be visualized as:

• Initial climate forcing → Initial climate response → Response amplified

Example: An increase in heat energy sent to Earth by the Sun causes high-latitude snow and ice to retreat. This allows more sunlight to be absorbed by the Earth's surface, leading to further climatic warming (amplifying the changes underway). Another example is delayed bedrock rebound.

Negative Feedback Mechanisms in Climate Change

Initial climate changes can also lead to a reduced response:

• Initial climate forcing → Initial climate response → Response reduced

Example: Chemical weathering acts...

How a Tsunami Forms

In the subduction zone, the oceanic lithosphere enters the Earth's interior. The upper end of the plate is locked and dragged down, building up tension.

The sudden release of this tension generates the seismic field. The seabed rises, displacing a huge volume of water upward.

Waves generated by this movement spread in all directions.

As they approach the coast, friction with the bottom slows the wave down. The wave narrows and rises, potentially reaching tens of meters high.

The wave can penetrate several miles inland. After the first wave, others, potentially more destructive, may arrive, lasting several hours.

Tsunami Alert System

The seismograph detects earthquakes and sends the information to the host system.

If the magnitude...

Key Hydrological Terms

Aquifer

An aquifer is an underground layer where infiltrated water accumulates in significant quantities, typically contained by impervious rocks.

Groundwater

Groundwater percolates through permeable rocks and lies below the upper limit of the zone of saturation. It is easily contaminated.

Head of a River

The head of a river is where a river originates, often coinciding with the highest sector of the basin.

Channel

A channel is the bed or land where rivers, creeks, and streams run, usually corresponding to the line joining the lowest points of a river valley.

Flow

Flow is the amount of water in a river at a particular place and time. It varies depending on the season and rainfall.

Watershed

A watershed defines the borders of a river...

Planets: Composition and Atmospheres

Mercury

Mercury's magnetic field has a very low intensity. It has no real atmosphere, with only traces of sodium and potassium.

Venus

Venus: The atmosphere is made up of CO2. On its surface, temperatures are around 500 °C. It has dynamic geological similarities to those of Earth.

Earth

Earth: The atmosphere has a considerable proportion of oxygen. Its position in the solar system makes this the ideal conditions for the development of life.

Mars

Mars: The atmosphere, very dynamic, is composed of 95% CO2, and 5% for nitrogen and helium. It has water (ice) in its polar caps.

Jupiter

Jupiter is a gaseous planet (81% hydrogen and 18% helium) with a small solid core. It has 16 satellites.

Saturn

Saturn: The atmosphere is...