What would be the principal option for preventing a catastrophic meteorite impact, once a threatening object was identified?
A) changing the orbit of the object with small nuclear explosions
B) breaking the object into smaller pieces with nuclear explosions
C) evacuate the potentially affected area
D) constructing a physical shield around Earth
A
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The ultimate cause of tectonic plate motion is the
A) second law of thermodynamics. B) tendency for heat to spread out. C) escape of heat from Earth's interior. D) all of the above
Using the Periodic Table, what can you say about the element magnesium (Mg)?
A. it has 2 neutrons and 3 protons B. it has 3 electron shells C. it has 3 electrons in the outer shell D. All of these choices are correct.
Which of the following is a typical way in which shale is expressed in the landscape?
A. valleys and other low areas carved into the landscape B. slopes covered by loose debris from overlying rocks C. badlands D. soft slopes covered by small, loose chips E. All of these.
Volcanic gasses and aerosols can create an acidic smog called _______________, which poses a threat to life and health
Fill in the blank with correct word.