Notes, summaries, assignments, exams, and exercises for Geology for Secondary education

Class Organization

The nineteenth century was characterized by strong tensions between conservative forces and liberal abolitionists regarding the privileges of the past. New political ideas and principles centered on equality and justice sought to abolish the privileges that concentrated power within the clergy and the nobility. This led to a new social organization:

The Nobility

The nobility and the bourgeoisie integrated, though the former was stripped of many assets. The desamortización (confiscation) process began with the Cortes of Cádiz (1812) and continued during the Liberal Triennium (1820–1823).

The Clergy

The clergy also suffered the loss of their assets through the Mendizábal desamortización. The auction of church property benefited...

The Lithosphere and Tectonic Plates

The lithosphere is the rigid outer layer of the Earth, composed of the crust and the uppermost part of the mantle. It is not continuous but fragmented into gigantic pieces known as tectonic plates. Most of these plates cover both oceanic and continental areas. These plates move very slowly, causing continuous changes to the Earth's surface.

Continental Drift Theory

In 1912, the German scientist Alfred Wegener proposed that continents were once joined together in a supercontinent called Pangaea. Over time, this mass fragmented, leading to the current arrangement of continents. Wegener provided several types of evidence for this theory:

• Geographical: The coastlines of some continents fit together perfectly.
• Climatic:

Territory and Origins of Feudal Europe

The territory of medieval Europe extended between the Atlantic coast and the Russian plains, and between the northern coast of the continent and the Mediterranean Sea. Europe was formed by a mosaic of kingdoms and states whose common elements were the Christian religion and a distinct political, economic, and social structure: the feudal system.

After the death of Charlemagne, a period of great insecurity began across Europe. Its primary causes were:

• Internal struggles among the emperor's successors.
• Raids and attacks carried out by Muslim forces.
• A new wave of invading peoples: Normans along the European Atlantic coast, and Bulgarians, Magyars (Hungarians), and Slavs in the center of the continent.

As a consequence,...

The Birth of Earth

As the terrestrial protoplanet increased in volume, the gravitational pull exerted by the planetesimals that collided with it increased. In these violent clashes, a large amount of heat was released, causing the planet to become partially molten. This merger allowed the denser material to sink, forming the core, while the lighter gases moved outward to form the atmosphere. Intermediate-density materials rose to form the mantle. Once the surface cooled, the abundant water vapor in the atmosphere condensed, forming the oceans.

The Early Atmosphere

The early atmosphere is believed to have formed by the degassing of the planet's interior. It contained large amounts of carbon dioxide and water vapor, along with some nitrogen. The...

Components of an Electrical Circuit

An electrical circuit comprises:

• Generators: They transform other types of energy into electrical energy.
  • Mechanical generators: Transform mechanical energy into electrical energy, such as those that produce continuous current (dynamos) and alternating current (alternators).
  • Solar cells: Transform solar energy into electrical energy and are formed by semiconductor materials.
  • Chemical generators: Devices that transform chemical energy into electrical energy, such as batteries and cells.
• Receptors: Transform electrical energy into other forms of energy.
• Conductors: Energy paths that carry energy from the generators to the receptors.
• Control and switching elements: Monitor or allow the functionality of the circuits.

Internal Geological Processes and Earth's Relief

Internal geological processes are responsible for the formation of Earth's relief. Plate tectonics explains the deformation of the crust and the formation of large mountain chains. Conversely, external agents produce geological weathering of rocks, destroy topography, and shape the landscape.

Understanding Diagenesis

Diagenesis includes all mechanical and chemical processes affecting a sedimentary deposit after its formation.

The Rock Cycle: Interaction of Earth Processes

The rock cycle represents the interaction of the Earth's internal and external processes.

The cycle involves three main rock types:

• Sediments, when compacted, cemented, and sometimes recrystallized, form sedimentary rocks.
• Rocks subjected

Precambrian Era

The fusion of the Earth allowed its separation into two parts: a dense metallic core and a rocky mantle. This eon began approximately 4,500 million years ago and lasted until 2,800 million years ago.

Key Geological Events

• Differentiation: Formation of the metallic core and rocky mantle.
• Magnetic Field: Created by convection within the metallic core.
• Lunar Formation: Resulted from fragments ejected into space following a planetary collision.
• Atmospheric Development: Intense meteorite bombardment and mantle degassing created a dense atmosphere of water vapor and CO2.
• Hydrosphere: Initiation of the water cycle and the first granitic crust fragments, marking the beginning of plate tectonics.

Archeozoic Eon

Spanning from 3,800 to 2,500 million...

Galician, the mother tongue of about 2 million people, is spoken in the northwest of the Iberian Peninsula, in Galicia and the border areas of Asturias, Castile and León, and along the Latin-derived strip that extends south along the Atlantic coast to the entire Portuguese territory.

Historical Development

Galician was very important in Portuguese literature, and in the 12th century it was the literary language of the medieval period. From the 14th century onwards, the Castilian language imposed itself, and Galician lost its prestige. It resumed a distinct place with the Rexurdimento of the 19th century and the Constitution of 1978, which recognized it as an official language.

Dialectal Division

The Galician language presents its first dialectal...

Separation of mixtures:
- Mechanical: (forces)

- Sedimentation: The process consists of letting the substances stand for a sufficient time so that the solid particles fall to the bottom in layers, after which the upper part is separated.
- Decantation: Similar to sedimentation, but used with liquids of different density.
- Centrifugation: This is based on the same principles as the previous ones, using centrifugal force to clarify liquids.
- Levigation: Uses a stream of water whose density is greater than that of the substances to be separated.
- Filtering: Separates the liquid from the solid particles by means of sieves (filters, ceramic, etc.).
- Magnetic: Uses magnetic forces to separate ferrous metals from other substances.
- Chromatography: The...

Evidence of Evolution

• Biogeographical: Isolated species evolve differently.
• Biochemical: A comparative study of molecules (DNA and proteins) of distinct species. When two species are evolutionarily closer, there is greater similarity in their molecular structure.
• Embryological: A comparative study of the development of different animal embryos. When two species are evolutionarily close, they share more developmental stages.
• Paleontological: The study of fossils (living beings or their activity). Intermediate forms indicate kinship relationships (the "missing link").

Geological Processes and Surface Modeling

Weathering and Erosion

Geological agents like wind and water cause the wear of reliefs. Erosion consists of shifting rock fragments (clasts) and...