About what percentage of Earth's land surface was affected by glaciers during the Quaternary period?
What will be an ideal response?
During the last Ice Age, approximately 30 percent of Earth's land area was covered in ice.
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Why might the following nuclear reaction not be very good for energy production in a fission reactor?
U ? 
Ba + 
Kr + 1 neutron
A. The mass of the by-products is too high and therefore the energy released will not be high enough. B. The material only produces one neutron so the chain reaction will not be very efficient. C. Interatomic attraction between the products will impede the efficient separation of the atoms from the unstable nuclei. D. There are too many products produced. E. The products are too large.
which substance is the best transmitter of solar energy?
a - murkey water b - soil c - air d - rock e - they are all approximately equal in transmissivity
If the wind speed doubles, the wind force also doubles
Indicate whether the statement is true or false
Which of the following is false regarding wave cyclone development, intensification, and strengthening?
A) The process can occur along the polar front. B) A midlatitude cyclone, from birth to maturity to dissolution, takes an average of a month. C) Cyclogenesis is the name for this process. D) A midlatitude cyclone involves two fronts and three air masses. E) They can be 1600 km (1000 mi) wide.