Water Resources: Definitions, Eutrophication, and Pollution
1. Key Definitions in Water Resources
a) Renewal Fee: The richness, diversity, and biodiversity of the environment.
b) Catchment Area: The area bounded by the union of all the headwaters that form the main river, or the territory drained by a single natural drainage system. In other words, it is the area that drains its waters into the sea through a single river or discharges them into a single lake. A watershed is bounded by a line of summits.
c) Water Table Aquifer: The aquifer is the level at which
Read MoreSoil Formation and Composition: An In-Depth Look
**Soil: The Foundation of Terrestrial Ecosystems**
Strata: Horizontal levels that descend vertically, characterizing the vegetation of an ecosystem and sustaining life.
Humus: The most fertile layer of soil, formed by decaying organic matter, primarily leaves, and is highly nutritious.
Leaching: The process by which mineral salts are carried from a higher to a lower soil horizon.
Microbiota: Organisms that inhabit the soil, including worms, scorpions, centipedes, and other arthropods, seeking sustenance
Read MoreEarth’s Atmosphere, Climate, and Biodiversity
Earth’s Atmosphere: Composition and Function
The atmosphere is the **gaseous layer that surrounds the Earth**. It consists of a mixture of gases arranged in concentric layers of different thickness and density. This protective cover acts as a thermal regulator and regulates complex mechanisms, balancing ecosystems.
Atmospheric Composition
- The atmosphere is composed of a homogeneous mixture of gases, suspended particles, and liquid droplets.
- It consists mainly of **nitrogen (78%) and oxygen (21%)**.
Hydrology and Vegetation in Spain: Key Factors
**Influencing Factors**
- The weather plays the biggest influence since water in lakes and rivers comes from aquifers and precipitation.
- The relief and topography influence the organization of watersheds in the erosive capacity of the rivers and the formation of lakes and aquifers.
- The lithology is the rock type, and its characteristics may promote or facilitate surface runoff, water infiltration, and the formation of aquifers.
- The vegetation holds the soil and prevents its erosion.
- Human beings consume
Material Properties: Metals, Polymers, Ceramics, and Composites
Metals and Metal Alloys
Metallic bonds
Features:
- Ordered crystalline structure
- High electrical conductivity
- High thermal conductivity
- Ductility
- Reflect light (shine)
- Large alloy
- Plastic deformation
- They are tenacious
- Medium elasticity
- Medium voltage
Covalent Bonds: Polymers
Features:
- Material formed by long chains from the union called monomers (basic chain)
- Are not crystal
- Polymer mechanical properties vary
- Bad electrical conductors
- Thermal bad drivers
- Used as an insulator
- Low density
- Low-temperature decomposition
Ionic
Read MoreUnderstanding Soil Types and Foundation Engineering
Types of Land
Classification by RQD (%), one considers the following types of terrain in its initial state, in excavations:
- Excellent or Hard: Attackable with machinery and/or scaler, but not billed as a land of transit, broken rocks, soil, very compact, and so on.
- Good Quality: Attackable with a machine.
- Medium Quality: Attackable with beaks, but not with the shovel, as semicompact clays with or without gravel or gravel.
- Poor Quality: Attack with the shovel, and loose soils, topsoil, sand, etc.
- Very