Which of the following is an essential characteristic of an index fossil?
A) The organism lived in a very specific environment or two, such as tropical volcanic islands.
B) The organism lived for a very limited period of geologic time.
C) The fossils of the organism are exceptionally well preserved.
D) The organism lived on the land, not in the ocean.
Answer: B
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Sahel is the name given to a certain kind of desert ravine. Indicate whether the statement is true or false
A high birth rate coupled with a declining death rate resulting from increased food production and improved medical care is characteristic of the ________ stage of the demographic transition model
A) transitional B) revolutionary C) postindustrial D) stabilization E) preindustrial
The softest mineral on Mohs' hardness scale is ________.
A. diamond B. gypsum C. mica D. quartz E. talc
Sea Surface Temperatures (SST) are warmest
A. at the poles where long days during summer warm water. B. where oceans are deepest allowing for sufficient mixing. C. along the equator where the sun's rays are most direct. D. at the subtropics because descending air promotes clear skies.