The sinking of the RMS Titanic fueled research that would change the science of bathymetry. Indicate whether the statement is true or false
ANS: T
The "Iceberg Detector and Echo Depth Sounder" was created by a former employee of Thomas
Edison. This detector directed a sound pulse underwater ahead of the ship as crew members listened
for the echo. An echo indicated a submerged iceberg. It was easy to direct the beam downward to
sense the distance to the bottom of the seafloor. Information can be found in the section The First
Scientific Experiments Were Undertaken by Governments.
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In the Mercator projection, which piece of Earth is portrayed extremely large in comparison to its actual size?
A) low-latitude locations B) Greenland C) Brazil D) the continental U.S. E) none of the above
Groundwater as a water source may be better than surface water because
A) groundwater may be naturally purified by percolation through soil. B) groundwater is a self-replenishing resource that cannot be exhausted. C) surface water is not naturally self-replenishing. D) groundwater is more easily located than surface water.
Plutonium is
A. radioactive. B. chemically toxic to humans. C. fissionable. D. All of the choices are correct.
The advance and retreat of ice sheets
a. happened most recently about 18,000 years ago at the lower latitudes b. happened most recently about 350 million years ago at the lower latitudes c. happened most recently about 18,000 years ago over much of the northern hemispheres d. happened most recently about 18,000 years ago over much of the northern hemispheres and caused alternating periods of heating and cooling e. ice sheets were very stable throughout geologic time and did not advance or retreat