Geological Risks: Erosion, Volcanoes, Earthquakes, and Ground Movement
Geological Risks
Erosion
Erosion, a major manifestation of external geological activity, significantly alters landforms over time, sometimes dramatically changing landscapes. Various external geological agents contribute to erosion, including:
- Wind erosion
- Glacier erosion
- River erosion
- Marine erosion
Volcanoes
Prediction
- Return period and eruption type
- Volcanic precursors (tremors, topographical changes, electromagnetic and gravity anomalies, gas emissions, satellite-detected changes)
- Risk mapping
- Note: Explosive
Environmental Issues and Sustainability
What is Pollution?
Pollution is a disturbance of the environment caused by physical agents (such as temperature), chemical agents (like heavy metals in water), or biological agents (e.g., sewage), present in sufficient concentrations and in specific locations. It stems from human actions such as increased waste, biodiversity loss, desertification, and climate change. Pollution can be natural or anthropogenic (caused by humans).
Explain the Phrase “Polluter Pays”
This principle means that the polluter
Read MoreEnvironmental Problems and Solutions: A Comprehensive Guide
Environmental Problems and Solutions
Air Pollution
Air pollution is primarily caused by the emission of harmful substances such as CO2, SO2, CL2, dust, and smoke. These pollutants originate from various sources, including the burning of fossil fuels in power plants and industries, transportation, and forest fires.
Acid Rain
Acid rain occurs when emissions in the air react with water to form acidic solutions that fall to the surface as precipitation. This phenomenon can have detrimental effects on the
Read MoreExcreta Disposal and Wastewater Treatment: A Comprehensive Guide
Excreta Disposal and Wastewater
Indicators of Civilization
The level of civilization of a community can be measured by different indicators, one of which is the quantity and quality of sewage collection systems.
Satisfactory sewage removal involves:
- An annual volume of half a ton per person.
- Treatment for transporting waste harmlessly or at least to avoid ingestion or food contamination.
- Household facilities and sewage disposal systems that meet established technical requirements.
Excreta Disposal Systems
Urban
Sewage
This
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Vocabulary
A
Aquaculture
The farming of aquatic plant and animal species, marine or freshwater. Spain excels in raising trout in freshwater and mussels, clams, and other species in seawater.
Aquifer
An underground water reservoir that forms when rainwater infiltrates, encounters a waterproof layer, and accumulates on it. In Spain, aquifers are common in sedimentary basins of the Meseta Central.
Alluvial Deposits
Deposits left by flowing water (boulders, sand, etc.) when the water flow is not strong enough
Read MoreClimate and Geography of Spain: A Comprehensive Overview
Geography of Spain
Latitude and Climate Zones
Spain’s location in the Northern Hemisphere’s temperate zone influences its climate, resulting in diverse weather patterns. The Canary Islands, closer to the intertropical zone, experience less contrast. The peninsula’s position between two large bodies of water and two continents makes it a crossroads of varied air masses.
Influence of the Sea and Relief
The sea’s influence on the peninsula is limited due to its narrowness, indented coastline, and mountain
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