Shared Flashcard Set

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8.1
Soil
14
Science
7th Grade
01/18/2011

Additional Science Flashcards

 


 

Cards

Term
soil profile
Definition
vertical section of soil layers
Term
mechanical weathering
Definition
physical process that breaks rocks apart without changing their chemical composition
Term
horizon
Definition

a soil layer in the soil profile, most areas have 3- the

A_______(top soil layer)

B________ (middle layer)

C________(bottom layer)

 

Term
litter
Definition
leaves, twigs and other organic matter in the A horizon that changes to humus when it is exposed to decomposing organisms
Term
leaching
Definition
removal of minerals that have been disolved in water
Term
ice wedging
Definition
mechanical weathering process that occurs when water freezes in the cracks of rocks and expands breaking the rock apart
Term
soil type
Definition
differs depending on location and slope
Term
weathering
Definition
mechanical or chemical process that breaks down rocks into smaller and smaller fragments
Term
chemical weathering
Definition
weathering that occurs when air, water, and other substances react with minerals in rocks
Term
Oxidation
Definition

process that occurs when a material is exposed to water and oxygen

 

(iron will rust)

Term
climate
Definition
the pattern of weather that occurs in a particular area over many years
Term

soil changes

 

Definition
because of forming or natural disasters in an area
Term
soil
Definition
material that supports vegetation and is a mixture of weathered rock, mineral fragments, organic matter, water, and air; may take thousands of years to form
Term
humus
Definition
dark colored, decayed organic matter in soil that serves as a nutrient source for plants and promotes good soil structure, and helps soil hold water
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