Radioactive Decay, Phytoremediation, and Bioremediation of Metals
Radioactive Clocks
Radioactive elements are unstable and disintegrate at a precise rhythm. To measure the speed of this decay, we consider the half-life, the time it takes for a quantity of the material to reduce by half.
Isotopes:
- Chlorine-36. Half-life: 300,000 years.
- Hydrogen-3 (Tritium). Half-life: less than 1 second.
- Technetium-99. Half-life: 6 hours.
- Carbon-14. Half-life: 5,730 years.
Technetium-99 and Hydrogen-3 isotopes cannot be used to determine the age of fossils due to their short half-lives.
Read MoreSpain’s Water Resources, Natural Risks, and Environmental Challenges
1.3 Water Resources and Use
1.3.1 Water Consumption
- Consumers of water: Irrigation (80%), economic sectors, household use. Municipal use has increased to 160 liters/inhabitant/day.
- Non-consumptive uses: Fishing, aquaculture, navigation.
1.3.2 Water Balance
Water resources primarily come from rainfall and aquifers. Only 32% is available, and less than half of that is utilized.
Water Deficit Problems:
- Uneven resource distribution: Surplus in northern basins (North pit, Douro River) and scarcity in Mediterranean
Coastal Zones: Formation, Dynamics, and Communities
The Coastline
The coastline is the land between the upper and lower limits of the coast and adjacent areas directly influenced by the sea. It’s the contact zone between land and sea.
The Coast as an Interface
In the littoral zone, four Earth subsystems interact:
Atmosphere
- High moisture content, water particles, and salts.
- Winds influence currents, waves, intertidal life, and geology.
Hydrosphere
- Mainly marine waters.
- Models geology and provides habitat for coastal life.
Geosphere
- Determined by materials,
Chilean Hazardous Materials Classification
Different substances or hazardous materials are officially classified in the Chilean standard 2.120.Of89, which establishes the following classes:
Class 1: Explosive Substances
Includes:
a) Explosive substances, except those too dangerous to be transported and those whose primary risk is another class. Substances not themselves explosive but which can form explosive gas, vapor, or dust are not included.
b) Explosive articles, except devices containing explosive substances in such quantity or of its
Environmental Science: A Comprehensive Guide to Earth’s Systems
Environmental Science: An academic field offering an integrated, quantitative, and interdisciplinary approach to studying Earth’s components, their interactions, and their relationship with human systems to solve environmental problems.
Environment: The study of interactions between physical, chemical, biological, and social components of the natural world, including their effects on organisms and human impacts.
Multidisciplinary Field: Combines natural and social sciences.
Scientific Method: A planned,
Read MoreEssential Geographic Definitions
Altitude
In geography, altitude is the vertical distance of a point on Earth relative to mean sea level (MSL). This contrasts with height, the vertical distance between two points on the surface, and flight level, the standard pressure altitude measured by an altimeter above 20,000 feet MSL.
Archipelago
An archipelago is a chain or group of islands. These islands are typically located in open water, less commonly near large landmasses. They often have volcanic origins, sometimes forming ridges or hotspots.
Read More