________ streams flow year-round, fed by snowmelt, rainfall, groundwater, or a combination thereof
A) Permanent B) Ephemeral C) Intermittent D) Perennial
D
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Today, any pesticide banned for use and sale in the United States
A) cannot be produced for use anywhere in the world. B) can be produced but cannot be sold (but can be given away) for use elsewhere in the world. C) cannot be produced but can be sold for use elsewhere in the world. D) can be produced and sold to other countries.
Why can radioactive elements be used to determine the ages of rocks?
A. Their half lives do not change over time. B. Their half lives decrease predictably over time. C. Their half lives increase predictably over time.
Sediment production occurs primarily in ________ part of a river system
A) the outlet B) the flood plain C) the trunk stream D) the drainage divide E) the head waters
Judge the following sentence according to the criteria given below: The Pacific Ring of Fire is home to the majority of Earth's active volcanoes and large earthquakes BECAUSE of the prevalence of divergent plate boundaries along the Pacific Rim
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.