What is metamorphic grade, and present an example of how a rock reaches its metamorphic grade? What will be an ideal response?


Metamorphic grade is a term that characterizes the degree to which a rock has undergone metamorphic
change. When shale is metamorphosed, chlorite first begins to crystallize at about 200?C. If the
metamorphism stops there, the rock will be low grade. If temperatures and pressures increase, new
minerals replace chlorite, and if temperatures exceed 500?C, sillimanite will appear.

Environmental & Atmospheric Sciences

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If the surface stream water in Sample Site 2 is contaminated by the entrance of groundwater, what is a likely source of the contamination? Why?

The question is based on Figure 25-3, a map of a hypothetical landscape with an effluent stream flowing from northeast to southwest. Water table contours are drawn at 2-foot intervals and flow lines show the direction of groundwater movement at the top of the zone of saturation. The waste pit in the north was dug down to a depth just slightly above the water table in that location. A fenced pasture for grazing livestock is in the east. Two wells are shown, and the locations of three water quality sampling sites along the stream are indicated. What will be an ideal response?

Environmental & Atmospheric Sciences

If all of the stratospheric ozone suddenly disappeared, ________

A) plants would flourish B) insects would be the only organisms to survive C) Earth's surface would warm considerably D) there would be a dramatic decrease in skin cancers E) most life on Earth would cease to exist because of the amount of UV radiation penetrating the atmosphere

Environmental & Atmospheric Sciences

List and describe the ways relative humidity changes in nature. Compare relative humidity to dew-point temperature

What will be an ideal response?

Environmental & Atmospheric Sciences

Polar regions receive

A. maximum variation in solar isolation and high zenith angles. B. minimal variation in solar isolation and high zenith angles. C. minimum variation in solar isolation and low zenith angles. D. maximum variation in solar isolation and low zenith angles.

Environmental & Atmospheric Sciences