What causes a mirage?

a. A layer of cold air close to the ground.
b. The physiological effects of water deprivation.
c. A layer of warm air close to the ground.
d. A "sandwich" of layers of warm, cold, and warm air.
e. Extremely hot air all the way from the ground to the top of the atmosphere.


c

Physics & Space Science

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Early astronomers picture the Earth as stationary, with the ________ spinning, moving the stars along with it

Fill in the blank(s) with correct word

Physics & Space Science

What is spectral resolution? Why can a large telescope allow for a higher spectral resolution than a smaller telescope?

What will be an ideal response?

Physics & Space Science

The high concentration of iridium at the Cretaceous Tertiary boundary is most likely attributed to

A) a worldwide rise in sea level. B) meteorite bombardment. C) an out flux of iridium from Earth's interior. D) none of the above

Physics & Space Science

Which of the following models best explains why our galaxy has spiral arms?

A) The spiral arms are a wave of star formation caused by a wave of density propagating outward through the disk of the galaxy. B) The spiral arms are composed of groups of stars that are bound together by gravity and therefore always stay together as the galaxy rotates. C) The spiral arms were imprinted on the galaxy at its birth. Ever since, like a coiling rope, the spiral arms have been wound tighter with each galactic rotation. D) No model can explain the existence of the arms, which rotate with the galaxy like the fins of a giant pinwheel toy.

Physics & Space Science