Why is Afghanistan referred to as the "Graveyard of Empires", and what are three empires Afghanistan has "laid to rest"?
War is difficult to conduct in Afghanistan because it is landlocked and has rough, mountainous terrain. Several countries have suffered losses in life, and concluded retreat from Afghanistan was the best option. These are Great Britain, Russia, and more recently according to historians, the United States.
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Eutrophication and oxygen depletion in natural wasters can be very damaging to stream ecosystems. Which of the following is the primary cause of oxygen depletion in streams?
A. excessive carbon dioxide B. iron oxide runoff C. acid mine drainage D. acid rain E. excessive nutrients
What is the meaning of the half-life of a radioactive-decay process?
What will be an ideal response?
Which of the following statements about fracking is false?
a. Between 10% and 40% of the fracking fluid pumped down a well returns to the surface as toxic fracking flowback wastewater. b. After a 3-year study, the EPA reported there was no evidence of the presence of toxic chemicals associated with fracking in contaminated well water in Pavillion, Wyoming. c. Discharging of fracking flowback waste through wastewater treatment plants has caused corrosion of downstream utility company’s equipment in Pennsylvania. d. The fracking flowback wastewater includes chemicals that are carcinogenic, neurotoxic and radioactive. e. Contamination of groundwater supplies by fracking flowback wastewater leaking through a cracked pond liner is a very real possibility.
According to Figure 19.42, a drowned coral reef in the Caribbean that is under 70 meters of seawater is
A) about 7 million years old. B) about 10 million years old. C) about 12 million years old. D) about 20 million years old.