exam 3 Flashcards
(86 cards)
Geology
Study of dynamic processes taking place on the earth’s surface and in its interior
Three major concentric zones of the earth
Core
Hot minerals
Mantle
Less dense region, magma
Crust
Complex mineralogical composition, iron, calcium, aluminum, on the land
Continental crust
Oceanic crust = 71% of crust
mineral
Naturally occurring chemical element or inorganic compound that exists as a crystalline solid
Rocks
brandt, limestone sandstone
We mine for gold and salt
Rock cycle
Named by the way in which they form
Sedimentary rock
Formed thru transportation of water, wind, gravidity, accumulate in layers (sandstone, limestone shale)
Tiny particles of weathered and eroded types of rocks deposited and accumulate in layer
Metamorphic rock
Existing rock subjected to high temperatures, pressures, fluids, or a combination
Igneous rock
Forms under intense heat and pressure then cools
Tectonic plates
Convergent
Plates moving toward each other, collide
Volcano, mountain ranges
Divergent
Move away
Transform plate boundary
Move in opposite directions BUT PARALLEL
Ore
Deposit in earth’s crust with one or more valuable minerals
Contrians profitable concentration of a minera
High grade or low grade
High grade ore more sustainable to mine
Rare earth minerals
Produce lots of waste
China dominates in processing
Fossil fuels
Oil, coal and natural gas → remains of plants, animals, microbes
Living things
Accumulation of organic matter
Exist in finite amounts
surface Mining
Surface and stip mining
Removes shallow deposits
Extracting deposits in horizontal beds close to the earths surface
Open pit mining
Dig large pits to remove ore
Mountaintop removal
Explosives to remove top of mountain to expose underground area for access
Environmental probs of mountaintop removal
U pollute water bodies
More erosion
Risk of flooding
Subsurface mining
Underground shafts elevators tunnels to get to mineral
Human health effects - resource extraction - mining
Ore extracted by mining
Ore mineral
Tailings is the waste polluted water slurry
Chemicals in here
Could be leftover sediment
Smelting
Roast ores heat ores
Heat and chemicals
Result
Air pollution
Water pollution
Human health effects
Dangerous for miners- can develop black lung
Video
Using toxic mercury to aggregate the gold
And it goes back into the soil via waste
What can WE do
Recycle
Waste less
Use less
Find a substitute
Do without
Biomining
Using living organisms to mine particular minerals of interest
Microorganisms able to clean salt water
Volcanoes
Release molten rock from the earth’s interior
Magma rising to earth’s surface thru a fissure in earth’s surface
Eruption: release of hot ash into the air
Mt vesuvius destroy pompeii
Earthquake
Breakage and shifting of rocks
Occurs at a fault