What do unconformities represent? What will be an ideal response?
Unconformities represent missing time; the geological record is not complete at an unconformity. In a
sequence of sedimentary rock layers, some rock may be missing due to nondeposition, erosion, or
both, and this means that that time period is not represented. A nonconformity is an erosional surface
cut into metamorphic or igneous rocks and covered by sedimentary rocks. The principle of inclusions
can be used to determine the relative ages of the igneous (or metamorphic) and sedimentary rocks
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Humid subtropical climates
A) occur in the lower latitudes of western North America. B) often have convectional thundershowers in summer. C) typically receive nearly all of their rainfall in winter. D) are often influenced by cold or cool ocean currents.
The decomposition of peat layers in soils ____
a. ?releases sodium bicarbonate into groundwater b. ?can result in flooding in land drained for farming c. ?is usually caused when the peat layer is exposed by digging or tilling d. ?happens during abnormally dry seasons e. ?transforms the peat into clay
Saturated air is forced down the leeward side of a mountain. On its way down, the air undergoes warming because of compression. What is the rate at which the air will heat up?
A) 20°C per 1,000m of descent (11ºF per 1,000ft of descent) B) 10°C per 1,000m of descent (5.5ºF per 1,000ft of descent) C) 6°C per 1,000m of descent D) 1°C per 1,000m of descent