Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
31 Cards in this Set
- Front
- Back
|
Soils can be found in almost every place on Earth except
|
Excessive deserts
|
|
|
Where can soils be found?
|
Grasslands, tropical rain forest, deciduous rain forests
|
|
|
An unconsolidated material at the surface of the earth that serves as a natural medium for growing plants
|
Soil
|
|
|
How many years does it take the deciduous rain forest to form one inch of soil?
|
100 years
|
|
|
How many years does it take the desert to form an inch of soil?
|
1,000 years
|
|
|
Topsoil
|
surface of soils containing accumulated organic material
|
|
|
Loam
|
A medium textured soil composed of silt, sand, and clay with organic matter
|
|
|
Humus
|
Dark colored soil which is high in organic material
|
|
|
Red and yellow hue soils indicate good ______________.
|
aeration
|
|
|
Gray and olive soils are ______________.
|
poor
|
|
|
The parent material of soils
|
bedrock
|
|
|
Old soils are less fertile than young soils because
|
the nutrients are leached out
|
|
|
Where is the oldest U.S. soil found?
|
Sierra Nevada Mountains
|
|
|
In the northern third of the U.S. , soils are less than _______.
|
20,000 years old
|
|
|
What gas do plants use?
|
Carbon dioxide
|
|
|
What are three basic needs of growing plants?
|
Sunlight, water, and carbon dioxide
|
|
|
Organic matter contains what element?
|
Carbon
|
|
|
Soils form from sediment deposited by ________, _________, and ______________.
|
running water, wind, and glacial ice
|
|
|
The most valuable food producing soils in North America , Europe, and Asia, were deposited by:
|
wind
|
|
|
Cotton, wool, and hides are examples of ___________.
|
fiber products
|
|
|
Loess
|
Soil deposited by wind
|
|
|
Humus
|
Dark organic part of soil
|
|
|
Sink
|
Repository
|
|
|
Histosol
|
Organic soils of wetlands
|
|
|
"O horizon"
|
organic layer
|
|
|
"A" horizon
|
top soil; zone of leaching
|
|
|
"B" horizon
|
subsoil; zone of accumulation
|
|
|
"C" horizon
|
Zone of transition; zone of partially weathered parent material
|
|
|
"R" horizon
|
bedrock
|
|
|
Examples of PA bedrock:
|
slate, shale, granite, and marble.
|
|
|
Why do farmers fields not contain organic layers?
|
They remove the trees and shrubs
|
