The ____________________ is a boundary separating cold polar air to the north from warm subtropical air to the south, the greatest contrast in air temperature occurs along the ____________________
Fill in the blank with correct word.
ANSWER: polar front; frontal zone?
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Answer the following Volcanoes questions.
1. Calculate the relief for each volcano by subtracting the lower elevation on the transect line from the higher elevation. Enter the relief into Table 20.1.
2. Calculate the length along each transect between the contour lines you used to measure the relief, using the scale bar. You can also calculate the length of each transect by measuring the transect with a ruler and using the written scale to convert it to feet. Enter the length into Table 20.1.
3. Calculate the slope in percentage by dividing the relief by the length. Enter the slope into Table 20.1.
Why is pegmatite an economically important igneous rock?
A) Pegmatite's crystals are huge, so they are very valuable. B) Pegmatite is very rare, so it is valuable. C) Pegmatite's crystallization process causes the enrichment of rare ore minerals. D) Pegmatite is perfect for the production of certain weaponry.
What is the long-term trend in mid-latitude ozone column depths? Can it be explained by the observed increase in stratospheric chlorine and bromine?
What will be an ideal response?
How does a dike differ from a sill? What will be an ideal response?