Notes, summaries, assignments, exams, and exercises for Geology for Competitive examination

Conditions for Life

Several key factors make life on Earth possible:

• Water
• A magnetic field
• A protective atmosphere
• Carbon compounds
• An energy source

Biotic and Abiotic Factors

Biotope: The non-living part of an environment, including all abiotic factors.

Biocenosis: All living things from every species within a defined area that provides the necessities for survival.

Ecosystem: A natural environment where living things interact with each other and their surroundings.

Trophic Levels

Ecosystems often have distinct trophic levels:

• Tertiary consumers
• Secondary consumers
• Primary consumers
• Producers

Predation

Predation is an interspecific relationship where one living thing kills another for food.

Soil Composition

Topsoil: Composed of partially decomposed organic matter...

Unique Properties of Water

Water is a molecule that consists of two hydrogen atoms and one oxygen atom. Water is special because its highest density is in liquid form rather than solid form, which is the case for most substances. It is also called the “universal solvent” because of its ability to dissolve more substances than any other liquid found on Earth, due to its unique chemical composition and physical attributes.

Cohesion and adhesion are two very important water properties.

• Cohesion is the property that allows water molecules to stick to one another (e.g., a drop of water holding its shape).
• Adhesion is the property that allows water molecules to stick to another substance instead of slipping off.
• Capillary action is the movement of

Wallow (verb)

To roll about or lie in water, snow, mud, dust, or the like, as for refreshment.

Taillights (noun)

A light, usually red, at the rear of an automobile or train.

Dangled (verb)

To hang loosely, especially with a jerking or swaying motion.

Upholstery (noun)

The materials used to cushion and cover furniture.

Leer (verb)

To look with a sideways or oblique glance, especially suggestive of lascivious interest or sly and malicious intention.

Sizzling (verb)

To make a hissing sound, as in frying or burning.

Haggle (verb)

To bargain in a petty, quibbling, and often contentious manner.

Strew (verb)

To let fall in separate pieces or particles over a surface; scatter or sprinkle.

Pail (noun)

A deep, cylindrical vessel, usually of metal, plastic, or wood, with...

Introduction to Semiotics and Verbal Language

This topic is divided into three main blocks: semiotics or semiology, verbal language, and non-verbal language in human communication. The development starts with semiotics, defining its general study points. Then, it addresses verbal language and non-verbal language to establish practical relations and the fusion of these two languages in human communication.

Before diving into the development of the topic, we will define the capacity of language as a common mechanism to transfer or share information by means of shared signs and/or articulated sounds.

1. Semiotics and Semiology

This science studies the history, currents, and classification of signs.

1.1. Object of Study and Definition of the Science

Semiotics...

Human Evolution in the Iberian Peninsula

Evolutionary primates produced the first hominids, which began their evolution in Africa 5-6 million years ago. Following the earliest australopithecines came Homo habilis and then Homo ergaster, which spread to Europe. Homo erectus later reached Asia.

Ancient remains found at Atapuerca, studied by professors Arsuaga and others, show that these early humans used carbon and fire, and that Homo erectus lived about 800,000 years ago, when a common ancestor of the Neanderthals and Homo sapiens existed. Early humans in this era were scavengers and hunters, and some practiced cannibalism.

During the Paleolithic period, humans were nomadic hunter-gatherers who advanced in areas such as art, culture and spiritual...

Demographic, Economic and Political Crisis in the Late Middle Ages

The late 14th and 15th centuries saw a deep, widespread crisis, marked by the Black Death and recurring plague outbreaks that interrupted the expansive growth of the previous period.

Demographic Aspects

Population growth was reversed by high mortality. In the Kingdom of Aragon the population fell by about one third, and in Castile by about one fifth. Adverse causes included famines, bad harvests, and epidemics (especially the plague).

Economic Aspects

Economic activity declined sharply, and much of the land was left uncultivated, with a shortage of labour in Castile and a fall in construction. The development of transhumant livestock farming, which obtained large profits from wool,...