In correct order from the center outward, Earth includes which units?
A) core, crust, mantle, hydrosphere B) inner core, outer core, mantle, crust
C) inner core, crust, mantle, hydrosphere D) core, inner mantle, outer mantle, crust
B
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Water supplies in Northern Africa and Southwestern Asia include
A. rain and snowfall feeding rivers B. underground reservoirs that accumulated millennia ago C. desalination D. all of the choices are correct
Which of the following would NOT help to improve water quality?
A. Stop using fertilizers B. Keeping your car well maintained C. Composting yard waste D. Watering plants with water from rain barrels rather than municipal water. E. Not using jet skis
What is a scientific theory?
A. A possible explanation that has not yet been tested B. A possible explanation that has been tested and found to be false C. A widely accepted and logical explanation of natural phenomena that has survived rigorous testing D. A prediction made about a scientific phenomenon
What best describes how petroleum is different than coal?
A. is a less concentrated form of energy B. contains considerable amounts of hydrogen C. is a less volatile form of energy D. contains more carbon atoms E. forms only in sedimentary rocks