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

The Muslim Invasion of the Iberian Peninsula

The so-called "holy war" began during the first expansion of the Arabs and Muslims in North Africa, the Horn of Africa, and the Atlantic coasts. Taking advantage of the Visigothic crisis, Muslim Arabs and Berbers crossed the Strait of Gibraltar in 711, starting the conquest of the Iberian Peninsula.

Berber leader Tariq ibn Ziyad defeated the Visigoths at the Battle of Guadalete (711), where the last Visigothic king, Roderic, lost his life in combat. Following this success, the invaders continued their advance into Hispanic lands, reaching Zaragoza. Within three years, the Muslims had conquered most of the land without encountering significant resistance. Only some mountainous regions of the Pyrenees...

Causes of the First World War

The rivalries between France, Germany, Britain and Russia in the late nineteenth century laid the groundwork for the conflict. Germany became the main power in Europe after the Franco-Prussian War of 1870. In 1879, the Triple Alliance was formed between Germany, Austria-Hungary and Italy, while France formed an alliance with Russia in 1892. The economic differences between Germany and Britain, which stemmed from the early twentieth century rivalry in trade, added further tension.

Balkan Conflict

Tensions in the Balkans intensified when Austria-Hungary annexed Bosnia and Herzegovina in 1908, while Russia encouraged the Slavic peoples to oppose Austro-Hungarian and Ottoman influence. In 1912, Bulgaria, Greece and Montenegro...

Freewheel Mechanisms and Ratchet Types

19. What is the freewheel mechanism used for? The freewheel mechanism is used in bicycle wheels and in automobile starter motors. It allows the motor to transmit movement to the engine during starting. Once the engine reaches a higher speed than the starter motor, the freewheel disengages so the starter is not damaged.

20. What types of ratchets exist? A ratchet is a mechanism that allows movement in one direction and prevents it in the other. Ratchets are classified as reversible if the direction can be changed, or locked/non-reversible if they only work in one direction. They can be external, internal or frontal.

Electric Arc Welding and Oxyacetylene Welding

21. Description of electric arc welding. It uses...

Ancient Greek Sculpture

The Greek sculpture

VIII century BC to I century BC: ancient art
Archaic period: VIII to VI century BC
Classical period: V to IV century BC
Hellenistic period: III to I century BC
Greece becomes a Roman province.

During the Archaic period, monumentalism dominated. Unlike other cultures, the Greeks conceived their art following Protagoras, who postulated that "man is the measure of all things."

Portraits

Portraits were the first representation of the individual. Figures appear either in the round, free-standing (which can be viewed from all sides), in relief (carved stonework), or in low relief.

This is one of the basic features that can be considered in the formation of the Greek sculpture.

Notable Archaic Works

Samos, Pythagoras...

Understanding Sintered Materials and Powder Metallurgy

What are sintered materials and what are their characteristics? Their objective is the high-precision production of parts from material powders, compressing them in a mold at high pressures and proximate temperatures, followed by fusion and self-lubricating joints.

Describe the process of obtaining materials through powder metallurgy.

• Obtaining powders: Atomizing liquid metal with air pressure or centrifugal force from a large metal disc.
• Pressing: Compressing the powder while cold.
• Sintering: Heating near the fusion temperature.
• Finishing: Lamination or machining of the piece.

Applications of sintered materials:

• Highly porous: Filtering elements.
• Porous: Self-lubricating bearings.
• Dense: High-precision

2nd World War (1939-45):

1925: The Locarno Pact was accepted by France, Germany and the allies, and the Treaty of Versailles was partially undermined. 1928: The Kellogg-Briand Pact condemned war. 1929: Germany stopped paying reparations and began rearming. Japan's imperialist policy and the weakness of the Western democracies and the League of Nations are key factors in the outbreak of war.

The Asian path to war: 1)

The invasion of China by Japan (1931) led to the creation of Manchukuo in Manchuria. Japan left the League of Nations. 1933: Japan withdrew from the League. The Meiji Restoration had already ended the shogunate.

2) Revisions of the Treaty of Versailles and Hitler's rise to power

1933: Germany abandoned the League of Nations. 1935: Compulsory...

Magma: Composition and Types

Magma is molten rock. It is composed of fused silicates, although it may contain other molten materials such as oxides, sulfides, or sulfates in very low proportions. Magma is distinguished into three types:

• Basaltic (Basic) Magma: The most fluid and abundant type. It is produced by the partial melting of mantle material. It melts at higher temperatures, has a higher density, and consists of Fe, Mg, and Ca silicates.
• Andesitic (Intermediate) Magma: The least abundant type, produced by the partial melting of oceanic crust.
• Granitic (Acid) Magma: The most viscous type. It melts at lower temperatures, and the melting occurs from the continental crust. It is lighter and composed of Na, Ca, K, and Fe silicates.

Igneous Rocks

Igneous...

1. Concept of Immunity

Immunity is the set of defense mechanisms that an individual possesses to confront invasion by any foreign body and the appearance of tumors. Any kind of immunity matures and consolidates over the years of life. In invertebrates, it involves cells that differentiate into the same agencies as the DCIR, and their types are recognized by immune cells.

The immune system is responsible for conferring immunity. This system, present in invertebrates, reaches its peak in the complexity of humans, primates, and others. The science in charge of studying these processes is called immunology.

2. Defenses of the Body Against Infection

2.1. Non-specific defenses

Present in the body naturally, they are defined as the mechanisms that tend...

Earth's Internal Structure

Scientists cannot directly observe the interior of the Earth. Deep drilling has reached only about 12 km, far short of the planet's center. Instead, knowledge of the interior comes from the analysis of seismic waves produced by earthquakes. These waves reveal the internal layers, their compositions, densities, and the discontinuities that separate them.

The main layers are the crust, the mantle, and the core. The crust is composed mostly of rocks rich in silicon and aluminum. The mantle is dense and largely solid, but it behaves plastically over long periods. The core is mostly iron and nickel, with an outer liquid part and a solid inner part.

Lithosphere and Asthenosphere

The lithosphere includes the crust and the uppermost,...