ANSWER ASAP PLEASE Explain the meaning of the term "soil taxonomy," using taxonomic examples to illustrate application of the field.

Answer:

Soil in this text is a natural body comprised of solids

(minerals and organic matter), liquid, and gases that occurs

on the land surface, occupies space, and is characterized by

one or both of the following: horizons, or layers, that are

distinguishable from the initial material as a result of additions,

losses, transfers, and transformations of energy and matter or

the ability to support rooted plants in a natural environment

(Soil Survey Staff, 1999). This definition is expanded from the

previous version of Soil Taxonomy (Soil Survey Staff, 1975) to

include soils in areas of Antarctica where pedogenesis occurs

but where the climate is too harsh to support the higher plant

forms.

The upper limit of soil is the boundary between soil and

either air, shallow water, live plants, or plant materials that

have not begun to decompose. Areas are not considered to have

soil if the surface is permanently covered by water too deep

(typically more than about 2.5 m) for the growth of rooted

plants. The horizontal boundaries of soil are areas where the soil

grades to deep water, barren areas, rock, or ice. In some places

the separation between soil and non soil is so gradual that clear

distinctions cannot be made.

The lower boundary that separates soil from the non soil

underneath is most difficult to define. Soil consists of the

horizons near the earth’s surface that, in contrast to the

underlying parent material, have been altered by the interactions

of climate, relief, and living organisms over time. Commonly,

soil grades at its lower boundary to hard rock or to earthy

materials virtually devoid of animals, roots, or other marks

of biological activity. The lowest depth of biological activity,

however, is difficult to discern and is often gradual. For

the practicality of soil survey, the lower boundary of soil is

arbitrarily set at 200 cm. In soils where either biological activity

or current pedogenic processes extend to depths greater than

200 cm, the lower limit of the soil for classification purposes

is still 200 cm. In some instances the more weakly cemented

bedrocks (paralithic materials, defined later) and uncemented

bedrocks (some densic materials, defined later) have been

described below the lower boundary of soil and used to

differentiate soil series (series control section, defined in chapter

17). This is permissible even though the paralithic materials

below a paralithic contact are not considered soil in the true

sense. In areas where soil has thin, pedagogically cemented

horizons that are impermeable to roots, the soil extends as

deep as the deepest cemented horizon, but not below 200 cm.

For certain management goals, layers deeper than the lower

boundary of the soil that is classified (200 cm) must also be

described if they affect the content and movement of water and

air or other interpretative concerns.

In the humid tropics, earthy materials may extend to a depth

of many meters with no obvious changes below the upper 1 or

2 m, except for an occasional stone line. In many wet soils,

gleyed soil material may begin a few centimeters below the

surface and, in some areas, continue down for several meters

apparently unchanged with increasing depth. The latter

condition can arise through the gradual filling of a wet basin

in which the A horizon is gradually added to the surface and

becomes gleyed beneath. Finally, the A horizon rests on a thick

mass of gleyed material that may be relatively uniform. In both

of these situations, there is no alternative but to set the lower

limit of soil at the arbitrary limit of 200 cm.

Soil, as defined in this text, does not need to have discernible

genetic horizons, although the presence or absence of genetic

horizons and their nature are of extreme importance in soil

classification. Plants can be grown under glass in pots filled

with earthy materials, such as peat or sand, or even in water.

Under proper conditions all these media are productive for

plants, but they are non soil here in the sense that they cannot

be classified in the same system that is used for the soils of a

survey area, county, or even nation. Plants even grow on trees

or in cracks of exposed bedrock (i.e., rock outcrop), but trees

and rock outcrop are regarded as non soil.

Soil has many temporal properties that fluctuate hourly,

daily, and seasonally. It may be alternately cold, warm, dry,

or moist. Biological activity is slowed or stopped if the soil

becomes too cold or too dry. The soil receives additions of

fresh, undecomposed organic matter when leaves fall or grasses

die. Soil is not static. The pH, soluble salts, amount of organic

matter and carbon-nitrogen ratio, numbers of microorganisms,

soil fauna, temperature, and moisture status all change with

the seasons as well as with more extended periods of time.

Soil must be viewed from both the short-term and long-term

perspective.

THIS IS EARTH SCIENCES
If -----------are spaced closely together on a map, there is a drastic temperature change over a distance.
A. Isobars
B. Warm fronts
C. Isotherms
s D. Occluded fronts​

A chemical that binds to a receptor with the channel directly on it is a(n _____ ?

The layer of the Earth called the mantle is often described as convecting. In this context, convection is
A.
a process that keeps the mantle stationary.
B.
a continuous cycle in the Earth's interior.
C. a step in the formation of sedimentary rock.
D.
a process that occurs on the Earth's surface.

Which of the following professionals would be hired to examine a manufacturing site and review certifications and
permits?
O environmental lawyer
O environmental policy maker
O environmental resource managers
environmental compliance specialist

briefly explain the relationship between cells, organs and tissues

Any resource necessary to the survival of populations in an ecosystem may become a(n)
A. abiotic factor.
B. biotic factor.
C. limiting factor.
D. niche.

Why can scientists compare the amino acid sequences of the proteins of three different living organisms?

A. because the genetic code is universal for all organisms
B. because the basic anatomy for all living organisms is the same
C. because RNA cannot be used to show evolutionary relationships
D. because the sequence of RNA is the same in all living organisms

Which best explains how scientists confirmed that the moon formed around the same time as Earth?

Scientists determined the approximate age of fossils from the moon and Earth.
Scientists used radioactive dating to study the age of material from the moon and Earth.
Scientists explored the cycle of condensation and evaporation over time on the moon and Earth.
Scientists analyzed the content of gases that were part of the atmospheres on the moon and Earth.

Why do plants not have any special respiratory organs like animals? Give two reasons.

Explain the contribution of antigenic determinant in false negative and false positive tests

What do viruses, animal cells, plant cells, and bacteria have in common

Spartina, shown here, is a plant that grows along the South Carolina coast. it’s roots are often submerged in brackish water ( mixture of fresh and salt water ) as the tide rolls in and out along the shore

PLZZZ HELPPP
Explain how rocks can be analyzed to determine the history of an area.

The goal of a statement of purpose is:
A. to demonstrate that a hypothesis is wrong
B. To list the materials needed for an experiment
C. To calculate an average of two or more measurements
D.To indicate what is expected to be accomplished in doing an experiment

PLEASE HELP- Soon

If an impatiens flower experiences drought, then its leaves curl up and wilt as a response to water loss and as a means to reduce evaporation (water loss from the leaves).

What is the independent variable ?

What is the dependent variable ?

The almost pure cellulose obtained from the seed threads of Gossypium (cotton) is tough, fibrous, and completely insoluble in water. In contrast, glycogen obtained from muscle or liver disperses readily in hot water to make a turbid solution. Despite their markedly different physical properties, both substances are (14)-linked D-glucose polymers of comparable molecular weight. What structural features of these two polysaccharides underlie their different physical properties

The _____
layer of the skin is made of dead cells.

in the processes of photosynthesis what supplies the hydrogen(H) used in the formation of glucose

Which of the following is correct

Which of the following best describes a saturated fatty acid?

a. A lipid containing double bonds between carbons

b.A lipid sharing one pair of electrons between carbons

c. a nutrient organic molecule that is acidic

d.any lipid nutrient molecule containing carbons and hydrogens

Which describes primary succession, but not secondary succession?
a. Small trees and shrubs replace grasses and other small plants.
b. Large trees replace small trees and shrubs.
c. The process often begins on lifeless, barren rocks that form from a
volcanic eruption
d. The process often begins after a human disturbance, such as clear-cutting a
forest

What climate zone has high annual temperatures and a small yearly temperature range

this is a bag that churns up the food. it contains gastric juice and hydrochloric acid. gastric juices contains an enzyme that digests protein. the acid kills germs

Over millions of years silt washed into a lake formed layers of sedimentary rock. What type of rock was likely formedscien​

explain what happens to engery through a system ​

The endomembrane system works together in the ________ of lipids and proteins.

will give brainlist

Earth's surface is constantly changing, and new landforms are constantly taking shape due to natural processes. Which landform is most likely caused by deposition?
A. caves
B. valleys
C. Deltas
D. lakes

»
How many meters are there in 2.5 kilometers?

HELP!!! due today and ignore the one i chose if its incorrect

how does economics affect conservation?