_______________ is a network of canyons 4000km long and up to 600km wide on the surface of Mars
Fill in the blank(s) with correct word
Valles Marineris
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Motional Emf: As shown in the figure, a metal bar is in contact with a pair of parallel rails and is in motion with an upward velocity of magnitude ?. A uniform magnetic field is present, directed downward as shown. The direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.
What is a typical asteroid made of?
A. solid hydrogen B. liquid water C. solid carbon dioxide and other gases D. rock and iron E. water frozen into ice
A 10-solar-mass star is about ten times more luminous than a 1-solar-mass star
Indicate whether the statement is true or false
Which of the following best describes the nature and origin of the atmospheres of the Moon and Mercury?
A) They have thin tropospheres only, with gas coming from evaporation and sublimation. B) They have thin exospheres only, with gas coming from impacts of subatomic particles and photons. C) They have only small amounts of gas, all of which is leftover from outgassing long ago. D) They have very thin atmospheres produced by outgassing, but still have the layers of a troposphere, thermosphere, and exosphere.