Earth’s Formation, Interior, and Plate Tectonics
Earth’s Formation and Early Characteristics
Formation of Earth and Solar System (4.6 Billion Years Ago)
The Earth and solar system originated from a nebula, a swirling cloud of gas and dust. As the nebula spun faster, hydrogen concentrated at the center, forming the Sun.
The accretion theory proposes that remaining nebula materials formed planetesimals, varied rocks floating in space. Collisions between planetesimals created a molten mass of rocks, the primitive Earth.
As the molten Earth rotated,
Read MoreGeological Evolution of the Iberian Peninsula
The Plateau
An elevated plain at 600-800 m, formed by the erosion of the Hesperian Massif. It was reshaped by the Alpine orogeny, creating three distinct units:
a) The Former Paleozoic Base
Located west of the peninsula, erosion exposed raw materials like granite, slate, and quartzite. The relief is primarily peneplain, with occasional residual mountains. Rivers crossing the plateau have carved deep gorges.
b) The Mountain Ranges of the Plateau
Formed during the Tertiary period by the Alpine orogeny.
Read MoreExploring the Maracaibo Lake Basin: Geography, Climate, and Economy of Venezuela
Maracaibo Lake Basin
The Maracaibo Lake Basin extends northeast of Venezuela, nestled between the Perijá and Mérida mountain ranges. This vast tectonic depression covers approximately 52,000 square kilometers. Formed by the uplift of surrounding reliefs, the basin features a relatively uniform landscape. Its contact with the Mérida Cordillera is rugged, marked by alluvial fans and terraces, while the Perijá side is bordered by low foothills.
Regions within the Basin
The Maracaibo Lake Basin encompasses
Read MoreRecycling, Reclamation, and Reuse of Used Oils
Recycling, Reclamation and Reuse of Used Oils
Used Oil
Used oil originates from refining crude oil or synthetic oil. Due to use, handling, and storage, it becomes contaminated and no longer serves its original purpose. This contamination arises from chemical impurities and physical changes that cause the oil to lose its original properties.
Used oil includes synthetic oils, transmission oil, brake oil, and other oil or grease.
Deterioration Factors
Petroleum lubricants are hydrocarbons that decompose
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Item 3 (D): Soil
Soil
The superficial layer of the Earth’s crust. It consists of elements, liquids, gases, and solids.
Horizons
Soil layers that form the soil as a result of their evolution. Each horizon has its own physical, chemical, and biological characteristics.
Leaching
Process by which rainwater washes away substances to lower layers.
Soil Profile
This consists of all the soil horizons.
Pedogenesis
The science that studies the origin and evolution of the soil.
Brown Land
Located in oceanic climates.
Read MoreEarth’s Dynamic Processes: A Geological Overview
Weathering
Weathering is the response of solid materials to environmental conditions. Rocks formed deep within the Earth undergo changes when exposed to the hydrosphere, atmosphere, and biosphere. Weathering levels land relief by removing and destroying rock remnants, transporting them to lower levels, where they eventually settle and consolidate into new rocks.
Soil Formation
Factors influencing soil formation include rocks, topography, climate, plants, and animals.
Weathering Process Variables
Temperature:
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