Why is the molten metallic core of Earth necessary for life to exist?
What will be an ideal response?
Answer: Molten iron convects in the core, which generates the magnetic field of the planet. The magnetic field protects Earth from lethal cosmic rays.
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Sometimes tiny pyroclastic particles are ejected into the atmosphere and settle to the surface as a(n) ____________________. In contrast, a(n) ____________________ is a cloud of these tiny particles and gas that moves along or close to the land surface
Fill in the blank(s) with correct word
Proven reserves of oil are determined by
A) deposits that are possible to mine. B) areas identified as having possible fossil fuels. C) an estimate of oil deposits not yet discovered. D) the total of all oil deposits that have been mined.
In the reduction of an unsaturated aldehyde or ketone using H2 in the presence of a transition metal catalyst, which of the following statements is true?
A) Both the C=C and C=O bonds are reduced at the same rate. B) The C=C bond is reduced more rapidly than the C=O bond. C) The C=O bond is reduced more rapidly than the C=C bond. D) Unsaturated aldehydes and ketones do not undergo reduction under these conditions.
In a translational slide, the descending mass ________.
A. is moving and circulating within the flowing mass, behaving as a viscous fluid B. moves as a perfectly rigid block on top of a liquid layer C. slides as a generally intact block down a curved failure surface D. moves along a plane approximately parallel to the slope of the surface E. simply moves from one location to another, without specifying the mode of motion