Predict the coldest and hottest temperatures 1 foot below the earth’s surface at a location where the surface temperature may be expected to vary seasonally from 100ºF to -40ºF in a periodic fashion. When do these occur?
What will be an ideal response?
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All dark matter in our Universe falls into the category of "hot dark matter"
a. True b. False Indicate whether the statement is true or false
Which of the following explains why the Big Dipper will look different 100,000 years from now than it does today?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
It was the newly developed ________ theory which allowed Adams and Leverrier to predict the position of Neptune from the motions of Uranus
Fill in the blank(s) with correct word
The red laser beam from a helium-neon laser corresponds to a spectral line of
A) helium. B) neon. C) both of these D) neither of these