Differentiate the three types of magma based on igneous composition and silica content

What will be an ideal response?


Answer: Basaltic magmas have a mafic composition and approximately 50 percent silica. Andesitic magmas have an intermediate composition and 60 percent silica. Rhyolitic magmas have a felsic composition and contain more than 70 percent silica.

Environmental & Atmospheric Sciences

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Briefly contrast the general topography in the northern third of the map, with the topography in the southern two-thirds of the map. What might explain these differences?

The following questions are based on Map T-9, the “Park City, Kentucky” quadrangle (scale 1:24,000; contour interval 10 feet) and Figure 44-3, a stereogram of the same area (37°05'03"N, 86°05'27"W). The boundary of Mammoth Cave National Park is just beyond the northern margin of the map. The surface shown in the southern two-thirds of the map is predominantly limestone, whereas in much of the northern third, a layer of sandstone caps the limestone. What will be an ideal response?

Environmental & Atmospheric Sciences

Mass movement refers to the downslope movement of rock and soil under:

a. Pressure b. Friction c. Gravity d. None of the above

Environmental & Atmospheric Sciences

How is the decline in ocean fisheries considered an example of the "tragedy of the commons"?

What will be an ideal response?

Environmental & Atmospheric Sciences

The Ekman spiral is caused by ________

A) density differences in the water column B) the wind and gravity C) the wind and the Coriolis effect D) the pycnocline E) pressure gradients

Environmental & Atmospheric Sciences