How is the Enhanced Fujita Scale used to classify tornadoes?
The Enhanced Fujita (EF) Scale attempts to provide a wide range of criteria is estimating a tornado's winds by using a set of 28 damage indicators, including small barns, mobile homes, schools, and trees. The quality of building construction is also taken into account. Each structure of object is then examined for the degree of damage it sustained. The combination of the damage indicators along with the degree of damage provides a range of probable wind speeds and an EF rating for the tornado.
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Pesticide use ________
A) poses no environmental threat in this country B) will be eliminated as pests decrease as a consequence of years of pesticide use C) can be eliminated by changing the season when crops are planted D) will not be a problem as we learn to genetically modify predators E) may be a necessary part of modern technological agriculture
A group of concerned citizens was worried that their local water supply might be contaminated with naturally occurring arsenic. They decided to purchase a home arsenic monitoring kit and tested well water in their local area. After analyzing the data (shown below), the citizens wrote a letter to the editor of a local newspaper arguing that their data proved that the water supply is contaminated. They demanded immediate government action to address the problem. The local water board again tested the wells using their official water testing instruments and found average concentrations of 8.1 +/- 0.2 micrograms per liter. Assume the water board's reported measurements are the accepted value. The maximum permitted level of arsenic in water supplies is 10 micro-grams per liter. src="https://sciemce.com/media/4/ppg__1020817191133__f1q513g1.jpg" alt="" style="vertical-align: 0.0px;" height="119" width="470" /> It is later revealed that several of the citizens' samples from Well 2 were likely contaminated prior to testing, but the citizens decided to include these samples in their final data set anyway. Which characteristic of bad science does this illustrate?
A. Making use of bad statistics.
B. Attacking the scientists, not the science.
C. Confusing cause and effect.
D. Creating an argument based upon authority.
The Cenozoic Era began approximately ________ years ago.
A. 4.55 billion B. 531 million C. 65 million D. 252 million E. 2.6 million
Where is the majority of Earth's freshwater being stored?
A. rivers B. lakes C. glacial ice D. atmosphere E. groundwater