geology 103 exam 3 test questions

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just 9 elements account for hat percentage of the composition of the earths crust?
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Terms in this set (29)
just 9 elements account for hat percentage of the composition of the earths crust?
99.7%
extracting a single ounce of gold can easily require the mining of more than what?
more than 250 tons of rock and ore
the primary source of iron are banded from formations, which are only found in very few places on earth and only?
in very old sedimentary rocks, typically 2 billion years old
the US uses 25% of the world supply of aluminum and?
has no significant domestic deposits of aluminum or (bauxite)
what new techniques are being applied to the search for mineral resources?
all of the above
perhaps the most widespread undersea mineral resources are?
manganese nodules
The US is the number one consumer of energy in the world and uses how many BTUs of energy per year?
100 quadrillion BTUs
what country is now the number one producer of natural gas in the world
united states
a solid form of water (ice) that contains a large amount of methane trapped within its crystal structure is called
methane clathrate
It takes how many tons of tar sand to produce one barrel of oil?
two
Coal currently provides what percentage of the total U.S. energy needs?23%a pollutant of special concern with coal issulfurcurrently the best solar cells are about?20% efficientOne-third of all power plants in the US are hydroelectric, and they generate what percentage of the US electricity needs?6%ocean energy thermal conversion (OTEC) exploits the?temperature difference between surface water and water at depththe most important aspects of most alternative energy sources is that?they promise clean, pollution-free energynuclear fission isSplitting apart of atomic nuclei into smaller ones, with the release of energyThe worst nuclear disaster to occur in the United States was at?three mile islandFor technical reasons, on Earth, nuclear fusion is best done with isotopes of hydrogen, specifically?Deuterium and tritiumCurrently, the best solar cells are about...20% efficientOne-third of all power plants in the US are hydroelectric, and they generate what percentage of the US electricity needs?6%Ocean energy thermal conversion (OTEC) exploits theTemperature difference between surface water and water at depthThe Leaning Tower of Pisa is leaning because:Of a poorly laid foundation and a loose soil substrateThe two major types of land use are:Multiple use and sequential useWhich federal agency administers more than 40% of all land managed by the federal government?Bureau of Land ManagementAn important aspect of GIS map making is that:You can stack layers of informationAmong all types of geologic hazards, [WHAT] are the number one killer in the US.floodsThe US approach to digging the panama canal wasTo create a mid-isthmus lake and use locksWhat innovative technology was used to dig tunnels in Boston's Big Dig?ground freezing