What will the sun look like during a total solar eclipse?
Answer: The sun' light is completely blocked out, so it looks dark
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How do the results of (d) compare with the magnitude of the greenhouse effect on Earth?
What will be an ideal response?
Over the past 50 years, global life expectancy has
A) decreased by about 5 years primarily due to increases in viral infections. B) stayed about the same due to new diseases spread by global climate change. C) increased by about 5 years due to the development of many poor nations. D) increased by more than 20 years due to better health care and nutrition worldwide.
What is the main energy source for the hydrologic cycle?
a. evaporative cooling b. greenhouse effect c. gravity d. solar energy e. natural gas
Briefly explain how deep trenches form
What will be an ideal response?