The half-life of a radioactive element is the amount of time it takes for ____________________ of the atoms of the unstable ____________________ element to decay to atoms of a new, more stable ____________________ element.
Fill in the blank(s) with the appropriate word(s).
half, parent, daughter
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Regional geography is
A) the theoretical side of cartography. B) the part of human geography that emphasizes landscapes. C) a combination of elements from both human and physical geography. D) a sub-category of physical geography. E) what separates human from physical geography.
Acid rain is caused primarily by
A. burning gasoline. B. burning high-sulfur coal. C. the greenhouse effect. D. nuclear power generation.
Which of the following would one expect to find associated with low annual precipitation totals?
A) Fronts B) Convergence C) Subtropical highs D) Convection E) Mountain ranges
In general, extrusive igneous rocks have larger crystals than intrusive igneous rocks
a. True b. False Indicate whether the statement is true or false