31 Questions
Which component makes up the largest percentage of soil constituents?
Minerals
What is the main origin of soil?
Weathered rocks and minerals
What type of rock is formed due to high temperature and pressure, particularly in the mantle?
Metamorphic
Which process is involved in the formation of igneous rocks?
High pressure and fragmentation
What is the primary difference between primary and secondary minerals?
Secondary minerals are least resistant.
What kind of rocks are diorite, pumice, granite, obsidian, and adobe examples of?
Intrusive rocks
What does the Soil Forming Equation by Hans Jenny consist of?
cl, o, r, p, t
In a soil profile, what is a unique feature that may not always be observable?
horizons
Which scientist is credited with the Soil Forming Equation from 1941?
Hans Jenny
What does 's' represent in the Soil Forming Equation?
soil
Which vertical section of the soil consists of unique horizons in a profile?
Soil Profile
What is the dominant mineral composition of the C horizon in soil development?
Primary minerals (sand and silt)
Which horizon in soil development is characterized by the accumulation of secondary minerals?
B horizon
In which horizon of soil development do you find the zone of cluviation?
C horizon
What is the parent material of the 45% mineral component of soil?
Primary minerals
Which horizon is characterized by a bleached appearance and domination with primary minerals?
A horizon
Which horizon is characterized by 50% A and 50% B?
AB horizon
In the A/B horizon, what does the first letter represent?
Dominant characteristic
What is the characteristic of the AB horizon?
Dominant A horizon
Which horizon would likely have a weak presence of A characteristics?
BC horizon
What does AB signify in terms of the A/B horizon composition?
50% A and 50% B
What distinguishes Transition Horizon in a soil profile?
It consists of two master horizons
Which of the following is a common feature of Transition Horizon in a soil profile?
Presence of both characteristics of preceding horizons
What role does Transition Horizon play in a soil profile?
Serves as a gradational layer between different horizons
How does Transition Horizon contribute to soil development?
By aiding in the breakdown of minerals into nutrients
Which factor primarily influences the formation of Transition Horizon in a soil profile?
Climate conditions in the region
What type of change occurs in the chemical property and structure of the rock during chemical weathering?
The rock becomes softer
During chemical weathering, what happens resulting in the formation of a new mineral?
The rock's chemical properties change
What role does chemical weathering play in the formation of new minerals from rocks?
It alters the chemical composition of the rock
How does goethite contribute to chemical weathering and mineral formation in rocks?
By participating in the transformation of rocks into new minerals
Which process leads to the formation of new minerals as a result of goethite's involvement in chemical weathering?
Oxidation
Test your knowledge on the origin of soil, which is formed from weathered rocks, minerals, and decomposed organic matter. Learn about the constituents of soil and the different types of rocks like igneous rocks that contribute to soil formation.
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