Why do the tails of comets point away from the Sun?
What will be an ideal response?
The gases ejected by a comet are pushed by radiation pressure from the Sun. Just as a candle flame can be blown in the direction of wind, the comet tail is blown by the solar wind, made up of high-speed protons and other particles.
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Which of the following was missing from Alfred Wegener's hypothesis?
A) the geometrical fit between South America and Africa B) late Paleozoic glacial features C) paleomagnetic data from ocean crust D) similar fossils on widely separated continents
If water vapor saturation occurs at -2 degrees Celsius, this is formed: ________
Fill in the blank(s) with the appropriate word(s).
The longest wavelength on the electromagnetic spectrum are ________
gamma ultraviolet radio infrared
Which one of the following countries dominated world production of steel and textiles during the nineteenth century?
A) United Kingdom B) Germany C) France D) United States E) Russia