Approximately how many plant and animal species have been classified?
A) 100,000 B) 1.75 million C) 3.6 million D) 111.7 million
B
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Why are raindrops larger than 5 millimeters rare?
A) Because they start as snowflakes, they must grow much larger than 5 millimeters while falling from a cloud without sublimating. B) If they form larger than 5 millimeters then they will reach the ground as snow or hail instead of rain because they cannot melt completely. C) The frictional drag from falling is greater than the surface tension that holds the drops together when they get larger than 5 millimeters. D) There is no process to form large raindrops in clouds.
Producing responsible and constructive technology that can achieve sustainable solutions requires ________
A) funding for scientific research and elimination of damaging and inefficient technology B) importing inferior technology to developing countries while developed countries invest in green technology C) increase of technology developed through self-interest of large companies D) public pressure to put limits on environmental protection E) having citizens be cognizant of the need for politicians to work with "big business"
The study of the origin, evolution, and nature of the universe is _______________
Fill in the blank(s) with correct word
Which form of producing electrical energy produces the highest amount of CO2 per unit of energy, when expressed as a percentage of emissions released by burning coal directly?
a. natural gas b. coal-fired electricity c. Coal d. oil sand e. synthetic oil and gas produced from coal