Earth’s Interior Structure and Composition
Study of Earth’s Interior
Much of our knowledge about the Earth’s structure and composition comes from indirect studies, as direct observation is limited to approximately 10km deep within the crust.
Direct Methods
These methods involve analyzing material obtained through boreholes.
Indirect Methods
These methods rely on analyzing and interpreting the Earth’s physical characteristics, including seismic wave behavior, gravity, density, magnetism, internal heat emission, and meteorites.
Direct Methods
Based
Read MoreKey Concepts in Environmental Science
Acid Rain
Acid rain is precipitation that has become acidic due to air pollutants like SO2 and NO2. It encompasses both wet and dry deposition of acids from the atmosphere.
Biodiversity
Biodiversity refers to the variety and number of species within a specific geographic area.
Climate Change
Climate change is the alteration of climate patterns due to human activities, primarily the greenhouse effect and ozone layer depletion. The use of chlorofluorocarbons (CFCs) damages the ozone layer, increasing
Read MoreKey Iberian Geographical Features and Climatic Phenomena
Berrocal
Also called “chaos of balls,” berrocals are formed by the decomposition of granite, an impermeable rock that is hard but susceptible to chemical decomposition. This decomposition is intense in crack networks. Water seeps into cracks, and ice breaks the rock. This landscape is common in the Central System, particularly in the Manzanares Pedriza.
Cárcava
A recess or deep gully in the ground caused by water force on clay and loam, impermeable rocks. A set of gullies is called badlands. Gullies
Read MoreConker Hydrography: Water Resources, Usage, and Sustainability
Conker Hydrography
Conker’s hydrography is characterized by open borders and aquifers that share the same river courses. River flow and regime depend on the quantity of water received by the basin, mainly rainfall. Rivers are irregular, with floods during snowmelt or heavy rainfall and intense low-water periods. We distinguish between Cantabrian and Galician Atlantic slope rivers and streams.
Agriculture, Industry, and Water Use
Water use in agriculture and industry leads to the problem of resource
Read MoreEcosystems, Environmental Challenges, and Sustainable Practices
Ecosystems
An ecosystem encompasses all living beings in a given area, their interactions, and their environment. Large ecosystems are called biomes. These extensive regions are characterized by specific environmental conditions and inhabited by relatively homogeneous living beings. All ecosystems together constitute the biosphere.
For an ecosystem to survive, it must achieve a balance that sustains its populations and allows recovery from disturbances. These situations are not permanent.
Carrying
Read MoreEarth’s Origin, Structure, and Internal Dynamics
Item 14: Origin and Structure of the Earth
Source of the Solar System
Planetesimal Theory
- Solar Nebula: About 4,600 million years ago, a rotating cloud of dust and gas, larger than the solar system, began to contract.
- Gravitational Collapse: Contraction or collapse to form a central mass and a rotating disk around it.
- Formation of Protosun: The collision of particles in the central mass releases energy, initiating nuclear fusion of hydrogen, marking the birth of a star, the protosun, inside the nebula.