In some regions of the corona, the magnetic field does not loop back to the Sun, and the gas escapes unimpeded. These regions are called _______ and are believed to be the source of the solar wind
a. prominences
b. flares
c. granules
d. auroras
e. coronal holes
e
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Temperature in the air is decreased by the process of.
Consider what happens when you jump up in the air. Which of the following is the most accurate statement?
A) It is the upward force exerted by the ground that pushes you up, but this force can never exceed your weight. B) You are able to spring up because the earth exerts a force upward on you which is stronger than the downward force you exert on the earth. C) Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself which propels the body into the air. D) When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air.
Why do some of the bright stars (such as the one indicated by the arrow) in this photo have cross-shaped spikes over them?
A) The spikes are an artifact of photography through a telescope. B) The spikes are flares ejected from the surfaces of bright stars. C) Very bright stars tend to be slightly nonspherical in shape and therefore look like they have spikes in photos. D) The stars with spikes are actually binary star systems.
A solar eclipse can only occur when the Moon is ____
a. full b. new c. waning d. waxing e. rising