Submarine sonar systems can cause ____________ pollution that negatively affects whales and other organisms in the
ocean. Fill in the blank(s) with the appropriate word(s).
sound
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Why is it better to recycle metals than to mine more?
A. Ores contain toxic elements. B. It takes far less energy to recycle. C. Mining is less expensive than recycling but not environmentally friendly. D. all of the above E. none of the above
Fire history in an open pine woodland ecosystem would be best determined by ________
A) ambient air temperature B) soil chemistry C) charcoal in the soil D) tree ring scars E) the density of vegetation
During natural processes, heat transfer is always from:
A) gases to solids. B) warmer to cooler substances. C) cooler to warmer substances. D) solids to liquids.
The global recession of 2008 brought especially severe repercussions to economically weaker nations in the European Union, including all but which of the following?
A) Greece B) Ireland C) Italy D) France E) Spain