Natural Disasters and Relief in Andalusia
Volcanoes
Volcanoes are openings or cracks in the Earth’s crust through which molten materials escape. A volcanic eruption involves the expulsion of magma through a vent, often a crater, on the surface. Active volcanoes are currently erupting, while dormant volcanoes may erupt after many years. Eruptions can change the landscape, as expelled materials accumulate to form volcanic cones. Sometimes, eruptions can even create volcanic islands.
Earthquakes
Seismic events, or earthquakes, are sudden tremors
Read MoreMallorca’s Dune Systems: Formation, Communities, and Conservation
Mallorca’s Dune Systems
Mallorca boasts five significant dune systems, formed in under 50 years: Palm Bay, sandy areas, Mitjorn Estrenc, East Bay Best, and two in the Bay of Alcudia (Can Picafort and S’Albufera-Son Serra de Marina). Additionally, numerous smaller beach dune systems, in varying states of development, are found along the coast (S’Carbo, Cala Mesquida, Peguera).
The tourist boom of the 1960s led to urban development, resulting in the destruction of some dune systems. The dunes in Peguera
Read MorePlate Tectonics: Movement, Types and Evidence
Plate Tectonics: Movement and Types
Plate tectonics describes the large-scale motion of Earth’s lithosphere. The lithosphere is broken up into large slabs, which are spherical in shape. These plates move slowly and slide on the upper mantle.
Types of Plates
- Mixed plates: Composed of both continental and oceanic lithosphere.
- Oceanic plates: Consist only of oceanic lithosphere. An example is the Pacific Plate, known for its wide extension.
Plate Boundaries
- Constructive (divergent) boundaries: These are
Concrete Additives and Mortar Types: A Detailed Look
Concrete Additives
Air-entraining additives are chemicals that create tiny air bubbles within the concrete mass. These bubbles, with diameters less than 2mm, are incorporated in small doses.
Expanders are products based on aluminum powder that produce gas. This generates a volume increase of about 2% within the concrete mass, reducing segregation and exudation.
Water-repellents include waterproofing incorporators and air-entraining agents. They are prepared on the basis of soaps and petroleum products.
Read MoreBiosphere Resources: Soil Formation, Erosion, and Forest Management
Item 12. Resources of the Biosphere
1. Factors That Condition Soil Formation
Time is a nonrenewable resource because it takes a long time to regenerate. The factors influencing soil formation are: climate (conditional on the type of weathering of the bedrock, and of vital importance in their evolution), topography, the nature of the bedrock, biological activity, and time.
2. Soil Erosion and Desertification
Direct Methods for Detecting Erosion:
Physical Indicators:
- Grade 1: Sheet erosion – a more or
Ecology: Understanding Ecosystems and Their Impact
Ecology: Understanding Ecosystems
Ecology is the science that studies the interactions between living organisms and their environment.
Types of Ecology
- Individual Ecology: Compares the life cycle, migration, and size of two or more species.
- Behavioral Ecology: Studies the behavior of a species in its habitat.
- Population Ecology: Studies the population of one species.
- Community Ecology: Studies the interaction between two or more species.
- Ecosystem Ecology: Studies two or more species within the ecosystem.