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Aluminum
8% of the Earth's crust, dispersed and not profitable in scattered form.
Magmatic processes
Enrichment processes where crystals crystallize from magma and fall to the bottom of a magma chamber.
Hydrothermal veins
Mineral deposits formed from superheated water that precipitates materials into fractures as it cools.
Disseminated ore
Ore that is spread out and not concentrated enough to mine profitably.
Oceanic processes
Processes occurring at mid-ocean ridges involving hot magma and gas emissions that can result in mineral deposits.
Black smokers
Underwater structures emitting mineral-rich hot water from mid-ocean ridges.
Placer deposits
Concentrations of dense minerals deposited in streams due to water flow.
Precipitates
Minerals that are deposited when water evaporates, common in desert lakes.
Bauxite
An aluminum ore that is formed through weathering processes, often found in tropical regions.
Coal grading
The classification of coal based on its carbon content and properties, ranging from peat to anthracite.
BTU (British Thermal Unit)
A measurement of energy defined as the energy needed to raise one cubic centimeter of water by one degree Celsius.
Natural gas
A fossil fuel formed from organic materials that burns clean and is often found along with oil.
Fracking
A method of extracting oil from shale by injecting high-pressure water, sand, and chemicals to fracture the rock.
Crude oil
Unrefined oil extracted from the ground that is processed into various petroleum products.
Permeability
The ability of a rock to allow fluids to pass through its pore spaces.
Reservoir rock
Rock that contains oil and is permeable enough to allow oil to flow through.
Trap
A geological structure that prevents the upward migration of oil, allowing it to accumulate.
Surface mining
Extraction of minerals by digging large open pits to reach ore deposits.
Underground mining
Extraction of minerals from beneath the