The time necessary for one-half of the original number of radioactive atoms of an element to
decay to a stable daughter product:a.
extrusive d. strata
b. stratigraphy e. relative age
c. half-life
C
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Which of the following U.S. cities is considered a good example of successful urban land use planning?
A. Los Angeles, CA B. Las Vegas, NV C. Portland, OR D. Atlanta, GA
The Gulf of Mexico began to form during the ____ as North America separated from ____
A)Early Triassic; Africa B)Late Triassic; Africa C)Early Triassic; South America D)Late Triassic; South America E)Middle Triassic; Africa
________ metamorphism will occur when high-speed projectiles strike the Earth's surface
A) Fault zone B) Shock C) Subduction zone D) Contact
The UN's 1997 Convention on the Non-Navigational Uses of International Watercourses addresses issues with ________ that are shared among more than one country
A) seas B) rivers C) oceans D) farms E) all the above