Consider how “porosity” and “permeability” affect how well an underground rock unit can store and transmit groundwater. a. what is the difference between porosity and permeability?
b. why do igneous and metamorphic rocks typically display low porosity, but yet sometimes produce the properties suitable for the flow of groundwater?
c. consider the “do-it-yourself porosity demonstration” described on p. 319 and in figure 12.6 of your textbook. if 200 ml of water were left in the beaker after saturating the sand in the other beaker, what is the porosity of the sand?

Project: analyze it! data collected over the past century shows the earth currently in a slight warming trend, with an increase over that period of a little more than 1.0°f in average global temperature. the question of what is causing the trend has sparked controversy in both scientific and political circles. some argue that while temperature fluctuations are a normal part of the earth's climate cycles historically, an increase in co2 produced by industrial pollution and other forms of human activity is contributing to and even accelerating the increase, potentially leading to significant environmental problems. others argue that pollution-caused co2 is not a factor and that the increase is caused by natural cycles alone.objectivesresearch credible positions for and against the existence of global warming. write a short essay briefly outlining each perspective. directions locate two well-researched, credible articles, one for and one against global warming. after reading the articles, write a 300-word essay addressing the following: what is global warming, as described in the articles? what arguments are given for and against the idea. what actions are recommended by each position? in your opinion, what can be learned from the debate? what would you like to do next?