NRM 140 EXAM 3 CH 7,8 QUESTIONS AND ANSWERS | LATEST VERSION 2026 | GRADED A+

NRM 140 EXAM 3 CH 7,8 QUESTIONS AND ANSWERS | LATEST VERSION 2026 | GRADED A+ Fluorinated hydrocarbons/F-gases - answer-They are powerful greenhouse gases, their concentration is rising sharply, and there are no regulations in place. Deplete Ozone layer. Mainly come from electricity and heat production Industry - answer-21% of total greenhouse gases. Internal combustion engines, industrial processes, fugitive emissions, and cement production fall into this category. Fugitive emissions - answer-Are accidental release of gases from pressurized systems or occasional release of small amounts of gases from industrial processes. They occur mainly during the extraction, transport, storage and processing of fossil fuels and largely consist of CH4. Transportation - answer-14%. Such as evaporation of gasoline and other liquid fuels, accidental release of natural gas that includes methane, and vapors released from hot engines. Buildings - answer-6% by burning fossil fuels for heat. Coal - answer-Biggest contributor is China 30%. Coal power plants are only about 40% efficient Originated in swamps, where tree-sized fern relatives fell into water when they died, and were covered by layers of sediment. The organic matter was compressed and heated, carbonizing it. Said to be cheapestShaft mines - answer-Require tunneling through an overburden to get to coal seams, then blasting the coal out, and bringing it to the surface. This is difficult, dirty, and dangerous. A tunnel collapse can trap or kill miners, and the dust, if inhaled, can result in a disease called black lung Black lung - answer-lung disease caused by inhaling coal dust Open pit mining/Remediation - answer-a mining technique that uses a large visible pit or hole in the ground. First you have to get rid of the overburden (soil and rock) and put it somewhere else. Harmful because: - changes hydrology (floods) - pollute water with harmful chemicals Remediation: Holes are fixed and the land is covered in soil and grass/replanted Electrostatic precipitators - answer-Ash from coal made as it burns is run it through charged screens that strips electrons off the dust. Dust is then attracted to another and coal ash is caught. The slurry is pumped into a pond where the water evaporates, leaving the ash behind Fly ash settling ponds - answer-where coal ash will be left and is often next to rivers. This ash contains a number of heavy metals such as lead, arsenic, manganese, and barium, to name a few. It can fill a riverbed and make its water unsafe to drink for years to come.