What is hydrostatic equilibrium and how is it used to explain the internal stability of a star?
What will be an ideal response?
Hydrostatic equilibrium is the stable balance between weight and pressure. This shows that the inner layers of stars must be hotter because they must support more weight.
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The tidal pull of the Sun largely cancels that of the Moon at the ________ phases
Fill in the blank(s) with correct word
This famous photograph taken by the Voyager spacecraft shows
A) Earth as viewed from the outskirts of the solar system. B) a close-up of the rings of Neptune. C) the cloud of gas and dust in which our solar system was born. D) the Sun as viewed from the next-nearest star.
Of the fossil fuels, oil produces the most pollutants per kilowatt of energy produced
What will be an ideal response?
In a folded sequence of rocks we find older rocks at the axis of the fold and younger rocks away from the fold axis. The fold is
A) called a syncline. B) called an anticline. C) plunging. D) tilted.