Describe the geologic history of the Ancestral Rockies. What will be an ideal response?
During the Pennsylvanian, the southwest part of the North American craton experienced deformation
as a series of fault-bounded uplifted blocks. These blocks formed the Ancestral Rockies, which were
not all elevated at the same time. Uplift of some mountains was more than 2 km along near-vertical
faults, so the overlying Paleozoic sediments were eroded and the igneous and metamorphic
Precambrian basement rocks were exposed. Tremendous quantities of eroded red sediments were
deposed in the surrounding basins.
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Urbanization generally increases the lag time between the peak of rainfall and the peak of the resulting flood
Indicate whether the statement is true or false
A stream which receives water flowing from the surrounding aquifer is known as influent, whereas a streamflow which feeds groundwater is known as effluent
Indicate whether the statement is true or false
Desertification is usually accompanied by decreased erosion
Indicate whether the statement is true or false.
Life expectancy in parts of southern Africa ________
A) cannot be determined due to lack of adequate methods for data collection B) has fallen dramatically since 1990 C) has stabilized due to population control D) is starting to fall E) is on the rise