Earth Resources Flashcards

1
Q

crust

A

rigid, outermost layer of solid and liquid Earth resources, serves as platform for humans, protects,

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2
Q

plate tectonics

A

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

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3
Q

boundaries / faults

A

the edges of plates where the most motion is generated

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4
Q

types of actions along boundaries

A
  • 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
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5
Q

volcanoes

A

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

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6
Q

2 primary types of volcanoes

A
  • 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)
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7
Q

tsunamis

A

occur when an earthquake happens underwater

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8
Q

mineral

A

well-defined, naturally occurring, solid, inorganic, chemical compound

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9
Q

rock

A

an assemblage of one or more minerals

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10
Q

3 primary types of rocks

A
  • igneous: created by cooling magma
  • sediment: created by breakdown of igneous rocks and other abiotic substances
  • metamorphic: consolidation of sedimentary and igneous rocks
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11
Q

techniques used to identify economically viable mineral deposits

A
  • 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
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12
Q

mining techniques

A
  • 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
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13
Q

mining impacts on surface

A

deforestation, habitat fragmentation, soil erosion

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14
Q

mining impacts on atmosphere

A

dust and carbon emissions, transforming into other pollutants, deposited, accumulation, c.c.

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15
Q

underground mining impacts

A

collapsing the mine, sinkholes, pumping of groundwater which lowers water table

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16
Q

gangue

A

the valueless component of ore that is removed and discarded

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17
Q

coal

A

mostly C, contains H, S, and O impurities, originates from peat (decomposed materials of living things in the ground)

18
Q

formation of coal

A

peat is compressed by heat and pressure and starts to transform into lignite and then coal, process takes a long time, quality has degraded due to more impurities

19
Q

different qualities of coal that depends on carbon content

A
  • anthracite: most carbon-rich, contains most energy per unit
  • bituminous: lower carbon content, more common, contains gases that can lead to explosions when released
  • lignite: low carbon content, high sulfur and metal content,
20
Q

impacts of coal mining and energy use

A
  • coal mining is expansive and intrusive
  • creates atmospheric pollution
  • disturbance and destruction of habitats
  • acid mine drainage
  • abandoned mines and decommissioning
  • tailing/spoiling landslides
  • energy source depletion
  • damage to natural env
21
Q

methods to “clean” coal

A
  • scrubbers: decrease emissions by introducing a chemical reaction that changes sulfur into gypsum which contains less sulfur, leads to cleaner plant exhaust, turns carbon released into solid carbon which can be stored in the ground
  • fluidized-bed combustion: increases efficiency by mixing coal with limestone to limit pollution and create more heat
  • sequester carbon in storage: lowers net energy, energy intensive
22
Q

oil/tar

A

the most used fuel in the world, has been used in a variety of ways,

23
Q

formation of oil

A

petroleum is created by decomposed marine life, dead algae mixes with inorganic clays near ocean bottoms in a low-oxygen env which generates kerogen, when heated, it releases oil and gas into the sediment around it

24
Q

crude oil

A

raw material that is extracted out of the ground

25
Q

oil / tar sands

A

considered unconventional oil sources since it has combination of bitumen (thick, low-grade, crude oil), sand, and water, associated with heavy env degradation

26
Q

oil transport

A

substantial risk of env damage, pipelines are the most common way of transport, other methods include marine transport and direct extraction

27
Q

diversity of oil

A

comes from refining, heating the oil to vapourize and separate its components via distillation

28
Q

plastics

A

created by cracking ethane and propane with heat, turns them into ethylene and propylene, can be converted into polymers, durable, lightweight, decompose after a long time, generate a lot of pollution

29
Q

natural gas

A

volatile component that evaporates and remains trapped near its source, commonly accompanies coal and oil, the cleanest of the fossil fuels

30
Q

methane flaring

A

natural gas is emitted into the atmosphere thru this process, this wastes and loses energy since it’s expensive and intensive to capture and transport natural gas

31
Q

methane clathrates

A

mixture of methane and water which forms a solid ice-like structure, exist below the oceans, in permafrost, and outerspace, if it melts, methane is liberated into the atmosphere

32
Q

2 types of nuclear energy

A
  • nuclear fission: energy comes from splitting atoms
  • nuclear fusion: takes energy from the initial nuclear fission reaction to make another reaction to emit more energy, would be a self-maintaining system, development may lead to an unlimited supply of electricity
33
Q

uranium

A

non-renewable resource that doesn’t emit CO2 during energy production, radioactive, produces way more energy than fossil fuels when burned

34
Q

nuclear fission

A

bombarding the uranium with neutrons causes a chain reaction and splits uranium,

35
Q

uranium mining

A

can be open pit or underground, extensive processing concentrates uranium into yellowcake (intermediate form of U concentrate and is enriched to form low-grade, highly-enriched, U)

36
Q

uranium processing

A

using gaseous diffusion, U is separated, converted into a solid, and pressed into pellets, pellets are installed into fuel rods that are placed into a reactor,
fuel is used to vapourize the water, steam moves turbines, generates electricity, and steam is condensed

37
Q

uranium enrichment

A

takes low-grade U and concentrates its atoms to reach 4%, which is the min needed to sustain a controllable chain reaction

38
Q

“spent” fuel rods

A

filled with a large amount of dangerous radioactive material, placed in a water tank to cool down and decay to safer levels to ensure safe handling and storage

39
Q

major nuclear disasters

A
  • Three Mile Island (USA): gas leak
  • Chernobyl: released explosion, meltdown
  • Fukushima: earthquake and tsunami flooded reactor, meltdown
40
Q

nuclear energy and waste production

A

spent fuel rods are dangerous, no safe places to store radioactive materials, waste is generated at each step of mining, processing, and generation, not that efficient overall