How do soils form?
What will be an ideal response?
Answer: Chemical-weathering processes form soils, as indicated by the mineral additions, subtractions, and transformations that define soil horizons. Mineral dissolution and downward flushing of dissolved ions and fine-grained weathering products are characteristic of A and E horizons, where water enters the soil from rain or snowmelt and biologic activity forms acids and organic compounds that enhance mineral weathering. The B horizon contains colorful oxide and hydroxide minerals and clays that physically wash down from overlying horizons, precipitate from ions dissolved in the overlying horizons, or form in place by weathering reactions. Calcite precipitates in arid-region B horizons when water evaporates.
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Radiocarbon dating is useful in dating an event that occurred in the past ________ years.
A. 400 thousand B. 40 thousand C. 4 thousand D. 40 million E. 4 million
What meteorological conditions contribute to the formation of a strong radiation inversion? Why?
What will be an ideal response?
Rip currents form because
A) the longshore current gets intensified. B) there is more coastal upwelling than usual. C) neap tides bring extra energy. D) backwash occurs in a narrow zone.
The study of the origin, evolution, and nature of the universe is _______________
Fill in the blank(s) with correct word