What biofuels are used for transportation, and what is the potential for increasing biofuels in the United States?
What will be an ideal response?
The biofuels used for transportation are ethanol from corn and biodiesel from used vegetable oil. The production costs to make ethanol are almost twice as great as gasoline.
"In 2005–2006, 4.3 billion gallons of ethanol for fuel, the equivalent of 100 million barrels of oil, were used in the United States. Some 14% of the nation's corn crop is dedicated to this use; an ethanol factory also produces corn oil and livestock feed. Ethanol plants under construction will increase the production capacity to 6.3 billion gallons. A production tax credit of 51 cents a gallon helps ethanol compete with gasoline."
"Currently, ethanol represents about 1.6% of U.S. gasoline consumption. This could rise to 13% if the country's entire corn crop were devoted to ethanol production—an impossible assumption, given the importance of corn for animal feed and export. With some 75 million acres devoted to corn harvest in the United States, there is little suitable farmland for significant expansion."
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Animated maps have become popular with GIS users, as the maps to be animated can now be prepared in a GIS package. Describe an example, in which animated maps, either temporal or non-temporal, are useful as a visual tool.
What will be an ideal response?
An example of ________ is the migration of doctors and engineers to the United States after they have received years of government-financed schooling and training in Colombia
A) brain drain B) chain drain C) chain migration D) net migration E) cohort migration
To be classified as a mineral, a substance must be:
a. foliated. b. organic. c. regolith. d. accreted. e. crystalline.
In the late 20th century most metal prices were very low but metal prices increased dramatically in the early 21st century
Simultaneously, the early 21st century saw extensive "brown fields exploration" in which companies went to old mining areas and extracted old mine wastes or reopened old mine workings. What is the primary explanation for this activity? A) Environmental regulations make it impossible to explore anywhere but old mining areas, so this was the only place the companies could look for deposits. B) The companies were only interested acquiring properties through a sleazy land grab, and had no intention of doing anything with the deposits assuming no one cared about brown fields. C) The increase of metal prices made mineral resources that were previously uneconomic into ores that could potentially be extracted profitably. D) The old miners were wasteful and left large amounts of ore in the ground.