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Soils: An Introduction (Text) Singer & Munns
Introduction
11
Science
Graduate
04/17/2011

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Cards

Term
What is the total land area on Earth? (ha)
Definition
14.2 billion
Term
What is the total amount of arable land on Earth? (ha)
Definition
1.5 billion ha
Term
How are 'nutrients' produced in soils?
Definition
1.  the dissolution of soil minerals; 2.  microbial processes that convert organic forms of nutrients to inorganic forms
Term
Where on land might you not find soils?
Definition
Under the arctic and antarctic ice caps
Term
What is a pedon?
Definition
A minimum volume of soil: 1m2 of surface area by 1.5 m depth
Term
What are the five soil forming factors?
Definition
parent material, biota (vegetation), topography, climate, and time
Term
What two processes comprise weathering?
Definition
1) the separation of the rock's individual mineral particles, and 2) their alteration, destruction, or resynthesis to form new minerals
Term
What properties of humus make it analogous to clay?
Definition
1. water retention, 2. nutrient retention, and 3. cohesion
Term
Colliods are?
Definition
materials in the form of fine particles; 1 nanometer (1 nm) to 1 micron (1 μm)
Term
Soil texture refers to particle size whereas soil structure refers to?
Definition
particle arrangements
Term
The most important binding agents in forming aggregates are?
Definition
humus and clay
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