C14 - Earth's Resources
No description yet. This curated deck is ready for daily study.
Card preview (24)
finite
used up at a faster rate than they are replaced -will run out
renewable
replaced at same rate they are used at biofuels
examples of finite resources in industry
metal ores crude oil limestone
metal ores
extraction of metals
crude oil
-polymers -petrol
limestone
-cement -concrete
Earth’s natural resources will make
make new products -provide energy -warmth, shelter, food
renewable resources use
renewable crop for ethene - makes plastics more sustainable -wood chips = biofuel
time before fossil fuels run out
only estimates - uncertain of calculations
uses of water
agriculture - solvent -coolant - washing
potable water
fit to drink
impurities of water
-dissolved minerals - microbes
potable water will have
low amount of impurities
potable water is not
pure -dissolved substances still
uk rainfall
-falls to ground -replenishes fresh water stores - seeps down through soil/rocks to underground sources -obtained by drilling down to water well
aquifer
body of rock and/or sediment that holds groundwater.
water treatment - screen
passes through a screen of metal bars - to catch twigs
water treatment - settlement tank
soil and sand will settle out
water treatment - sludge is formed
-aluminium sulfate + lime added - small particles clump together -sludge is formed and dumped
water treatment - fine sand beds
-filtered through fine sand beds - removes remaining solid particles (grit)
water treatment - chlorine
• kills bacteria • or ozone /uv light is used
purifying sea water
• distillation (expensive) • reverse osmosis
water treatment - pH check
• checked for neutral -and stored ready for use
desalination of salty water
distillation