Earth Resources Flashcards
crust
rigid, outermost layer of solid and liquid Earth resources, serves as platform for humans, protects,
plate tectonics
motion is generated by convection in the mantle, which causes plates to move, results in topographical features and weather, movements cause minerals to move around and be brought up to the surface
boundaries / faults
the edges of plates where the most motion is generated
types of actions along boundaries
- divergent: plates move away from e/o, leads to mountains
- convergent: plates collide with e/o, forms faults
- transform/lateral: plates move side by side and scrape against e/o, creates volcanic activity and earthquakes
volcanoes
pipelines that take mantle material and bring it up to the surface, molten rock found underground is magma, when emitted by a volcano, it’s lava
2 primary types of volcanoes
- shield volcano: horizontal, massive, produces gentle but broad slope, magma flows easily, taller (ex. Hawaii)
- composite volcano: steep edges, sticky lava that doesn’t flow easily, wider, more explosive due to having more gas (ex. Mt. Pinatubo)
tsunamis
occur when an earthquake happens underwater
mineral
well-defined, naturally occurring, solid, inorganic, chemical compound
rock
an assemblage of one or more minerals
3 primary types of rocks
- igneous: created by cooling magma
- sediment: created by breakdown of igneous rocks and other abiotic substances
- metamorphic: consolidation of sedimentary and igneous rocks
techniques used to identify economically viable mineral deposits
- satellite imagery: used to identify deposits by looking at wavelengths of light which respond to diff things in the surface
- geomagnetic sensors: measure changes in magnetic fields generated by rocks
mining techniques
- open pit: cone-shaped, down into crust, dynamite
- dredging: underwater, for placer deposits (like gold which accumulates at the bottom of waterbodies)
- strip: linear, used for deposits created in layers
- shaft: dug into the crust with branches
- mountain top: removing mountain peaks
mining impacts on surface
deforestation, habitat fragmentation, soil erosion
mining impacts on atmosphere
dust and carbon emissions, transforming into other pollutants, deposited, accumulation, c.c.
underground mining impacts
collapsing the mine, sinkholes, pumping of groundwater which lowers water table
gangue
the valueless component of ore that is removed and discarded