The nucleus of old crystalline rock in each of the principal continental masses is called a
A) basalt mass.
B) continental shield, or craton.
C) mountain mass.
D) composite zone.
B
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Why might the following nuclear reaction not be very good for energy production in a fission reactor? Fe ? Si + Mg + 3 neutrons
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too small to obtain energy from the missing mass due to strong nuclear force. C) The products are not the right size to obtain much energy from the missing mass due to the strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
What causes the S-wave shadow zone? What causes the P-wave shadow zone?
What will be an ideal response?
Most glaciers worldwide are currently in a state of retreat
Indicate whether this statement is true or false.
Coal forms
A. through hydrothermal processes B. by crystal settling C. on the ocean floor D. by compaction of plant material