What process in the mantle is responsible for the creation of midocean ridges and seafloor spreading?
A. convection
B. conduction
C. subduction
D. advection
E. isostasy
A
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In Belgium, language boundary sharply divides the country into two regions: Southern Belgians speak French and northern Belgians speak Flemish
Indicate whether the statement is true or false.
Cross bedding is not characteristic of:
a. river-channel sediment b. beach sediment c. wind-deposited sediment d. turbidity current deposits
Consider the various kinds of relationships humans have with other species, both natural and domestic
Give examples of relationships that (a) benefit humans, but harm other species; (b) benefit both humans and other species; and (c) benefit other species, but harm humans. Give examples in which the relationship may be changing: for instance, from exploitation to protection. Discuss the ethical issues involved in changing relationships.
The atmospheric residence times of inert gases, such as helium and argon,
A. are strongly controlled by human activities. B. are quite short, as these gases are removed by precipitation. C. have virtually infinite residence times. D. cannot be estimated because their natural cycles are complex.