Exposure to 1.0 roentgen of which of the following types of radiation causes the formation of the most ions?
A) a
B) b
C) g
D) They all form the same number of ions.
D
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As water becomes scarcer, it becomes increasingly attractive as an investment opportunity
Indicate whether this statement is true or false.
Where does most of the material on the continental shelf come from?
A) Erosion from the adjacent continent B) Sediments transported from rivers C) Accumulations behind natural dams D) New crust formation
How do scientists measure the age of rocks at mid-ocean ridges?
A) radioactive dating methods B) comparison of rock samples on mountain ranges C) fossil stratification and the principle of horizontality D) magnetic polarity measurements
How does "brain drain" impact the underdeveloped countries?
A) Talented people (doctors, engineers, scientists) move to the developed world. B) Inadequate nutrition during childhood prevents the young from being healthy. C) Schools are often unfunded, which means talents are not fully developed. D) Investments in infrastructure are often poorly made and do not complement one another (an area might have running water but no electricity). E) None of the above are impacts of "brain drain."