What evidence is there that ocean basins are young and old oceanic crust must be destroyed? What will be an ideal response?
The maximum age for oceanic crust is 180 million years, but the continents contain rocks both
younger and much older than 180 million years. The older oceanic crust must go somewhere
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A package of weather instruments carried aloft by a balloon is called a
A) radiosonde. B) thermistor. C) bimetallic strip. D) thermograph.
The process of assimilation ____
A)includes melting and incorporation of inclusions of country rock B)includes the inclusion of country rock in an extrusive magma C)occurs in all plutons D)results in additional heating of a magma body E)separates mafic rock from felsic rock
The fish in the lake at the local park are dying, so a professor from the local college comes to investigate. First, she measures the dissolved oxygen because she wants to check for the ________
A) presence of bacteria B) influence of acid precipitation C) presence of heavy metals D) possibility of eutrophication
On a national level, environmental job opportunities are
A. Shrinking B. Being exported overseas C. Good now, but are expected to decrease in the next ten years D. Expanding E. Changing very little