What are the principle soil horizons? What processes dominate in each horizon?
What will be an ideal response?
AOEBC are the principle horizons. A (accumulation of leaf matter) is the layer that includes organic matter derived from accumulating leaves and branches. The O (organic) layer is organic material only, and can overlie the A layer where plant growth is dense. The E (eluviation, or washing out) horizon is pale in color, reflecting the absence of organic matter, easily weathered minerals, and clay minerals. It may or may not be present, below the A horizons. The B horizon is recognized by its usual red color, and the accumulation of minerals that are not present in the parent material such as calcite and clay minerals. The C horizon is the lowermost layer, least weathered, and provides parent material for soil formation.
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Explain the function of the World Trade Organization (WTO)
What will be an ideal response?
Quartz, feldspar, and clay minerals are the most common constituents of sedimentary rocks. Indicate whether the statement is true or false
With regards to carbon monoxide (CO), which of the following is false?
A) Anthropogenic CO is principally produced by automobiles. B) Natural CO is produced by decaying organic debris, forest fires, or organic matter decomposition. C) Few effects of CO on humans have been identified. D) It is a colorless, odorless and tasteless gas.
A caldera is
A. not associated with andesitic or rhyolitic volcanism, but only with basaltic volcanism. B. an alternate name for boiling mud pots in thermally active areas. C. a topographically low area that results from the collapse of a volcano after its magma chamber empties or removal of the top of a volcano during an explosive eruption. D. only preserved for short periods of time, so that ancient calderas do not exist.