Why do we know that the geothermal gradient near the surface cannot continue very deeply into
Earth? What will be an ideal response?
If the geothermal gradient near the surface continued at depth, the temperature at only 100 km depth
would be so high that all known rocks would melt despite the high pressure.
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Briefly discuss the relationship between plate tectonics, volcanic activity, earthquakes and tsunamis
What will be an ideal response?
Which of the following is true of all combustion reactions?
A) They are endothermic. B) They produce carbon dioxide. C) both a and b D) neither a nor b
When it is summer in the Northern Hemisphere, Earth is tilted
A) so that the North Pole tilts toward the Sun. B) so that the North Pole tilts away from the Sun. C) so that the South Pole tilts toward the Sun. D) so that the North Pole and South Pole are equidistant from the Sun.
Over the last century and a half, the main source of increased atmospheric carbon dioxide has been ________
A) volcanoes B) photosynthesis C) photoperiodism D) rock decomposition E) burning of fossil fuels