Explain what is meant by the term “Waldsterben”.?
What will be the ideal response?
ANSWER: In the late 20th century, many trees in Germany showed signs of a blight that was due, in part, to acid deposition. Apparently, acidic particles raining down on the forest floor for decades caused a chemical imbalance in the soil that, in turn, causes serious deficiencies in certain elements necessary for the trees’ growth. The trees were thus weakened and become susceptible to insects and drought. The impact on large forests was called “Waldsterben,” or forest death. The same type of processes may have affected North American forests, but at a much slower pace, with symptoms apparent in many forests at higher elevations from southeastern Canada to South Carolina.
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Which of the following accurately describes the relation between subsidence and stability?
A. Subsidence decreases stability. B. Subsidence has little effect on stability. C. Subsidence increases stability.
List the three types of simple features used in GIS and their geometric properties.
What will be an ideal response?
Which of the following rocks is composed of the smallest sedimentary clasts?
A. shale B. sandstone C. conglomerate D. breccia
The bright green spot that momentarily appears over a setting sun is called a
A) halo. B) sundog. C) superior mirage. D) green flash.