Earth’s Dynamic Processes: Plate Tectonics and Continental Drift
DYNAMIC EARTH
The Earth is not a static layer of rock but is in continuous transformation.
A) The Earth’s Crust
- The continental crust has a thickness of 35-40 km, with a varied mineral composition (outer granitic and basaltic layers).
- Continents extend hundreds of kilometers under the oceans in the so-called continental shelf, ending in a slope called the continental slope.
- The oceanic crust has a homogeneous thickness of about 7 km, with a basaltic composition and young rocks. It occupies more than
Understanding Earth’s Resources and Processes
Natural Resources
Natural resources are elements provided by nature without human intervention, which can be harnessed to meet human needs. They are classified into two groups:
Renewable Resources
Renewable resources regenerate under suitable conditions in the short term, allowing for human intervention in their reproduction. Examples include flora and fauna.
These resources are replenished through natural processes. Their use does not lead to irreversible decline as long as the consumption rate does
Read MoreEvolution of Peninsular Relief Morphostructures: Geological Eras
Evolution of Relief Morphostructural Peninsular Units
a) Precambrian Archean (4000 – 600 million years)
A band from northeast to southwest emerged from the sea, an arqueda formed by shale and gneiss, occupying almost all of current Galicia. Elevations also arose in individual points of the Central and Toledo Mountains. This Precambrian massif was later eroded and almost entirely covered by Paleozoic seas.
b) Primary or Paleozoic Era (600 – 225 million years)
The Hercynian orogeny took place. From the
Read MoreExploring Earth’s Dynamic Systems: Climate, Geology, and Hydrology
Geo-Astronomical Areas and Solar Radiation
The sun’s rays fall perpendicularly on the land located north and south of the Equator.
Heat Transfer
Driving transmits heat through contact.
Circular Winds and Low Pressure
Cyclones are circular winds around low-pressure areas.
Roraima Group Formation
The Roraima group was formed during the third tecto-thermal event.
Internal Hydrosphere Movement
Tsunamis are an internal cause of hydrosphere movement.
Low-Level Condensation
Mist occurs when condensation happens at
Read MoreUnderstanding Iberian Peninsula’s Hydrology, Climate, and Soil
Factors of the Iberian Peninsula
Climate
Influenced by temperature and rainfall, Spain has two main climatic zones: wet (oceanic) Spain and dry (Mediterranean) Spain.
Relief
The relief influences watersheds, the erosive capacity of rivers and lakes, and aquifers. The terrain also affects the feasibility of hydraulic works. The type of rock determines water filtration capacity.
Vegetation
Vegetation curbs erosion, protects from solar radiation, and reduces evaporation.
Human Impact
Humans both utilize water
Read MoreCosmic Perspective and Evolution: From Big Bang to Modern Diseases
1. Cosmic Perspective and the Evolution of Life
1.1 Anthropocentric vs. Geocentric View
The anthropocentric perspective places humans at the center of the universe, while the geocentric system, like Ptolemy’s model, positions Earth at the center.
1.2 The Copernican Revolution
The Copernican Revolution shifted from a geocentric to a heliocentric system, with the sun at the center, resolving issues with Ptolemy’s model and explaining the movement of stars.
1.3 The Immensity of the Universe
Our sun is a
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