When snow thaws and refreezes, which results in a loss of air and pore spaces, the result is
____________________. Fill in the blank(s) with the appropriate word(s).
firn
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Which of the following is an example of numerical time?
A. The Silurian period occurred before the Devonian Period. B. The Silurian period began approximately 438 million years ago.
Which mineral gets weathered to weaken uplifted metamorphic rock?
A) silica B) argentine C) clay D) serpentine
Complete the concept map displayed below by selecting the correct response from the answers provided.
Complete the concept map by selecting the correct response from the answers provided for number 4.
A. Jupiter B. Earth C. Mars
What is population density?
A) the birth rate minus the death rate B) the birth rate minus the death rate with immigration and emigration also taken into account C) the average number of people per unit area D) the amount of farmland per person E) the total number of people in urban areas, minus the number of people in rural areas