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

Morphostructural Units of the Iberian Peninsula

Galician Massif

The Galician Massif underwent Tertiary rejuvenation during the Alpine orogeny. It forms the western part of the northern Meseta plateau and is made up of Paleozoic materials. Its relief consists of rounded mountains cut by numerous fault systems.

Cantabrian Cordillera

The Cantabrian Cordillera was formed during the Tertiary as a consequence of the Alpine orogeny. In the western sector of the cordillera, the Asturian Massif is made up of Paleozoic materials and forms a relief of high peaks and abrupt slopes. In the eastern sector, the materials are Secondary and Tertiary sediments deposited in a sea that covered the northern edge of the plateau. The Alpine orogeny lifted these materials...

Types of River Regimes

River regimes describe the characteristic annual variation in a river's flow. Several distinct types are recognized:

Nival Regime

This regime, known as the Nival Regime, is typical of higher mountain areas where waters freeze in winter, leading to a period of low flow. From early spring to late summer, the river receives a significant contribution from meltwater, resulting in increased flow.

Nivopluvial and Pluvionival Regimes

In these regimes, both nival (snowmelt) and pluvial (rainfall) factors combine. The nival factor is typically felt earlier than in purely nival regimes. These rivers are also influenced by rainfall during wetter months. Such fluvial regimes, often referred to as Nivopluvial and Pluvionival Regimes, occur...

Lakes of the Iberian Peninsula

In the Iberian Peninsula, there are not many endorheic areas. In the majority of cases (within the catalog of Spanish lakes), the gaps are small with shallow surface depth; such level oscillations mean they often disappear in summer. These are small lakes that human action has dried and turned into agricultural areas. We can distinguish the following types:

1. Endogenous Origin

These are related to tectonic events or volcanoes. The largest lakes on the Earth's surface have this source and can be very deep. In Spain, the best example is La Janda.

2. Exogenous Origin

These lakes have a most varied typology and can be classified according to the generating agent into the following types:

• Glacial: These are produced by

Coastal Relief Features

The following features describe the major landforms resulting from marine and continental processes along the coast:

• Headlands: Outgoing projections of the coast into the sea.
• Gulfs (or Bays): Inbound indentations from the sea to the shore.
• Cliffs: Steep slopes where the coast meets the sea. They often feature caves and arches (formed by marine erosion piercing the interior) and strong erosion areas, leading to the eventual collapse of the cliff top.
• Beaches: Flat, level extensions located on the coast, formed by marine and continental sediments.
• Marine Terraces (Rasas): Marine erosion platforms parallel to the coast that have been uplifted high above sea level.
• Rias: Submerged river valleys (incoming coastal indentations).

Characteristics of Spanish River Systems

Atlantic and Mediterranean River Features

Unlike the distinct characteristics of Atlantic and Mediterranean currents, Spanish rivers exhibit unique hydrological patterns:

Atlantic Rivers

• Rivers crossing the Meseta are long.
• Cantabrian and Galician rivers are short and irregular, with very intense dry periods in summer and sometimes in winter.
• The most abundant flows occur in autumn and spring, which are also the times when high water levels concentrate.

Mediterranean Rivers

• Generally short rivers with low streamflow, except for the Ebro.
• Irregular, with intense dry periods and large floods caused by heavy rainfall in spring and autumn.
• Often ephemeral streams or wadis, characterized by channels where water flows

Key Factors Influencing the Climate of the Iberian Peninsula

Latitude: Situated between 35º and 43º North, the Iberian Peninsula lies within the temperate zone, experiencing four distinct seasons. Location: Nestled between the Atlantic Ocean (more open and cooler) and the Mediterranean Sea (smaller, enclosed, and warmer). Water bodies cool and heat more slowly than continents, so the coasts are affected by the sea's thermoregulatory effect, preventing excessively high temperatures. Influence of the Sea: Relatively low, with continental influence being more significant. The Peninsula behaves climatically like a small continent; the land cools and heats rapidly, leading to significant temperature variations both daily and annually. In winter,...

Diphthongs

Described as vowel glides, since in their production the tongue begins in one place and moves to another. This movement of the tongue, however smooth, results in a change of vowel quality, which is why diphthongs are sometimes looked upon as 'combinations of 2 vowels'.

Diphthongs are usually classified according to whether they are:

• Falling or rising
• Wide or narrow
• Front or back
• Closing or centering

The diphthongs of RP are all stressed on the first element, described as falling. Those stressed on the finishing point (rising), can also be wide or narrow, according to the movement of the tongue from the first to the second target. Those in which the position of the tongue body changes quite noticeably are described as 'wide diphthongs'....

Atmospheric Dynamics: Vertical Movements and Stability

Convection

Vertical movements occurring in the troposphere, called convection, are caused by variations in temperature, humidity, or atmospheric pressure.

• Thermal Convection: These movements are caused by the contrast in air temperature. Air near the surface tends to rise, forming thermals of rising air, while higher up, the air tends to cool and descend.
• Moisture Convection: These are caused by the presence of water vapor in the air. Water vapor can be measured in two ways:

1. Absolute Humidity: The amount of water vapor in a determined volume of air, expressed in g/m³.
2. Relative Humidity: The amount of water vapor in 1m³ of air, expressed as a percentage, in relation to the maximum amount it can

Properties of Minerals

Physical Properties

Exfoliation: The property of minerals to split along a preferred direction. These minerals have a weaker union between each crystalline unit. It depends on the internal structure of the crystal and is constant for each mineral. The following grades are usually distinguished: excellent, perfect, good, very flawed, and imperfect.

Fracture: When a mineral fractures, the chemical bonds are broken irregularly, unrelated to the symmetry of the structure.

Toughness: The resistance of a mineral to being scratched. It depends on the chemical bonds. Its value is calculated by comparing it with other minerals of known hardness (Mohs scale).

Specific Gravity: A number that expresses the relationship between the mineral'...

The Galaico-Leonese Massif

The northwest corner of the Meseta Central, the Galaico-Leonese Massif, fractured and rejuvenated during the Alpine orogeny. It consists of Paleozoic materials and features rounded, low-lying mountains cut by faults. Its most prominent mountains are Segundera, Cabrera, and Ancares.

The Cantabrian Mountains

The Cantabrian Mountains have two sectors:

• The Asturian Massif: Composed of Paleozoic materials that were part of the Meseta Central and rejuvenated in the Alpine orogeny. Its western end features varying hardness of materials (slates and quartzites), while its eastern end consists of limestone.
• The eastern Cantabrian Mountains: Composed of Mesozoic limestone materials deposited by the sea and folded during the Alpine