FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 12: Soils

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 41

Multiple Choice

Review LaterAdd Note

Review Later

The productive wheat lands of parts of Washington, Oregon, and Idaho are underlain by soils incorporating volcanic ash and classified as ________.

A) Andisols
B) Mollisols
C) Alfisols
D) Oxisols
E) Histosols

Correct Answer

verified

Show Answer

Question 42

True/False

Review LaterAdd Note

Review Later

Acid soils deprive plants of nutrients by the process of leaching.

Correct Answer

verified

Show Answer

Question 43

Multiple Choice

Review LaterAdd Note

Which of the following represents an addition to soil water?

After gravitational water has drained away, ________ is the water that remains in the soil and is available for use by plants.

Organic matter usually comprises about ________ percent of total soil volume.

An Alfisol is most closely related to

Seeds germinate mainly in the ________ horizon.

Under natural conditions, the time necessary for soil formation is about equal to that for soil degradation.

The regolith is found on top of the soil.

The dynamic relationship between precipitation and evaporation in any given location is the ________.

The most weathered and leached of all soils are the ________.

Parent material is closely associated with which soil-forming factor?

In cool climates, areas of poor drainage have pedogenic regimes of gleization.

The soil classification system currently in use in the United States is called the ________.

________ are roughly similar to Alfisols except that they are more thoroughly weathered and more completely leached of nutrient bases.

Mollisols are, on the whole, the most ________ of all soil orders.

Which of the following horizons is found furthest from the surface of the soil?

The measure of acidity/alkalinity in soils is based on the relative concentration of active hydrogen ions.

Field capacity is the maximum amount of water that can be retained in the soil after gravitational water has drained away.

If you lived in Texas or California and your house foundation crumbled because the soil swelled when it was wet and cracked when it was dry, chances are that the soil would be a(n)