What is scoria? How is scoria different from pumice?
What will be an ideal response?
Scoria is the name applied to vesicular ejecta that is a product of basaltic magma. When magmas with andesitic or rhyolitic compositions erupt explosively, they emit ash and the vesicular rock pumice. Pumice is usually lighter in color and less dense than scoria, and many pumice fragments have so many vesicles that they are light enough to float.
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Indicate whether the statement is true or false
You spend the night at a hotel and notice a sign in the bathroom asking you to place dirty towels on the floor and to hang up towels that you wish to reuse. By doing so, the hotel chain can help "save the planet" by conserving water and detergent. You
recognize that the hotel chain would also save a lot of money by not having to launder so many towels, and you begin to wonder cynically whether the hotel isn't just practicing ________. A) environmental justice B) discounting C) greenwashing D) the externalizing of costs E) ecolabeling
Anemia results from a deficiency in ____.
A. cobalt B. iodine C. iron D. calcium E. phosphorus
Herbicides would be most useful in combating ________
A) weeds that infest our agricultural fields B) bacteria, such as Salmonella, which sometimes contaminate meat C) mosquitoes that spread malaria in tropical rain forests D) fungi that attack plant roots