What evidence reveals that water may once have been abundant on Mars? What will be an ideal response?
Images from spacecraft show areas with winding valleys that apparently were eroded by running
water.
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In the western United States, as compared to the eastern United States, the major water problem(s) is (are)
a. Flooding b. insufficient water for some urban areas c. chronic drought and insufficient runoff d. pollution of rivers, lakes, and groundwater e. insufficient water for industry
Which of the following is the definition for a scientific hypothesis?
A) The gathering of data through observations B) A tentative explanation used to explain observed activities C) A well-tested and widely accepted view that explains observable facts D) An educated guess
Most magma is generated in Earth's upper mantle by ________ of solid rock
A) decompression melting B) partial melting C) diffusion D) crystallizing
Africa's burgeoning middle class consumes many of the products theircountries would otherwise export
a. True b. False Indicate whether the statement is true or false