SOIL SCIENCE EXAM REVIEW QUESTIONS
AND 100% CORRECT ANSWERS!!
If current trends continue, the world population in 2050 will likely be?
more than 9 billion
A soil layer with properties contrasting with adjacent layers is called?
a soil horizon
Entities which are mapped or classified in a soil survey are called?
polypedons
Plant nutrients required in large quantities (more than 0.1% of dry matter) are:
macro nutrients
As a valuable natural resource, soil can be viewed as:
a reusable but non-renewable resource.
An ideal soil is?
1) about 50% pore space
2) less than half mineral matter
3) some organic matter
The smallest volume of soil that could be considered an individual "soil" is called?
a pedon
A horizon designated B t?
is an illuvial horizon
Soil Horizons
1) are layers of soil roughly parallel to the ground surface
2) Subdivisions of a profile
3) Present in all soils
, In 1900 AD, what proportion of the human population was involved in agriculture?
60%
The population on Earth in 2000AD was about?
6 billion
Our descriptive definition of soil is?
1) soil is formed by weathering and decomposition processes.
2) soil is composed of minerals and organic matter.
3) soil exists as an unconsolidated, porous medium.
An A p horizon is?
a surface horizon disturbed by recent plowing or other human activity
As a component of the terrestrial ecosystem, soil provides which of the following services:
1) providing a habitat for a variety of organisms.
2) storing and purifying water.
3) supporting plant growth.
The solum is?
the portion of a profile that has developed by soil forming processes
After metamorphic alteration, granite becomes:
Gneiss
Which of the following is NOT considered a "Factor of Soil Formation"?
Water
The chemical weathering reaction that causes the formation of gray colors in seasonally
saturated soils is called:
Oxidation-reduction
A Bg horizon
AND 100% CORRECT ANSWERS!!
If current trends continue, the world population in 2050 will likely be?
more than 9 billion
A soil layer with properties contrasting with adjacent layers is called?
a soil horizon
Entities which are mapped or classified in a soil survey are called?
polypedons
Plant nutrients required in large quantities (more than 0.1% of dry matter) are:
macro nutrients
As a valuable natural resource, soil can be viewed as:
a reusable but non-renewable resource.
An ideal soil is?
1) about 50% pore space
2) less than half mineral matter
3) some organic matter
The smallest volume of soil that could be considered an individual "soil" is called?
a pedon
A horizon designated B t?
is an illuvial horizon
Soil Horizons
1) are layers of soil roughly parallel to the ground surface
2) Subdivisions of a profile
3) Present in all soils
, In 1900 AD, what proportion of the human population was involved in agriculture?
60%
The population on Earth in 2000AD was about?
6 billion
Our descriptive definition of soil is?
1) soil is formed by weathering and decomposition processes.
2) soil is composed of minerals and organic matter.
3) soil exists as an unconsolidated, porous medium.
An A p horizon is?
a surface horizon disturbed by recent plowing or other human activity
As a component of the terrestrial ecosystem, soil provides which of the following services:
1) providing a habitat for a variety of organisms.
2) storing and purifying water.
3) supporting plant growth.
The solum is?
the portion of a profile that has developed by soil forming processes
After metamorphic alteration, granite becomes:
Gneiss
Which of the following is NOT considered a "Factor of Soil Formation"?
Water
The chemical weathering reaction that causes the formation of gray colors in seasonally
saturated soils is called:
Oxidation-reduction
A Bg horizon
