An isotope's half-life is equal to the time it takes ________.
A. half of the electrons in its outer most shell to be covalently bonded with oxygen
B. half of the neutrons to be converted into protons
C. half of the parent atoms to decay into daughter atoms
D. nuclear fission to begin once the isotope first forms
E. a one gram mass of parent atoms to disintegrate into one gram mass of daughter atoms
Answer: C
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The majority of the oil pollution in the ocean comes from
A. blowouts (rupture of a borehole of an oil rig in the ocean). B. tanker accidents. C. fisheries. D. runoff from land. E. normal operation of offshore wells.
Which statement about the properties of Earth’s crust is true at subduction zones?
a. Ocean crust is subducted because it is lighter than continental crust. b. Continental crust is subducted because it is lighter than ocean crust. c. Ocean crust is subducted because it is thicker than continental crust. d. Continental crust is subducted because it is colder and denser than ocean crust. e. Ocean crust is subducted because it is colder and denser than continental crust.
The Atlantic continental margin is presently a/an __________ margin. Fill in the blank(s) with the appropriate word(s)
Large populations have less genetic diversity than small populations.
Answer the following statement true (T) or false (F)