Which of the following does NOT help define layers in some sedimentary rocks?
A. a change in color
B. a change in mineral composition
C. a sharp contact between two rock types
D. a change in grain size
E. All of these are ways that can define layers in sedimentary rocks.
Answer: E
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Medical geographers have observed that the world-wide spread of HIV/AIDS from its hearth in Central Africa is best explained by a(n) ________ diffusion pattern
A) expansion B) hierarchical C) contagion D) combination of expansion and hierarchical
Which of the following is not one of the major tectonic plates on the Earth's surface?
A) Juan de Fuca Plate B) North American Plate C) African Plate D) Pacific Plate
The first species to colonize previously disturbed or damaged ecosystems are called a(n)
A) sere. B) pioneer community. C) successor. D) establishment.
Most climate models predict that Earth’s average surface temperature will increase by an additional ____________________ by the end of this century
Fill in the blank with correct word.