Science
Breaking of rock caused by a plant growing in a crack of a rock
Root Pry
What type of weathering occurs when large rocks break up into smaller rocks without changing the chemical composition?
Mechanical
the solid layer of rock beneath the soil
bedrock
____ up of prairie grasses exposed the soil of the Great Plains
Plowing
The method of plowing the remains of the previous year's crop into the ground is called ________
Conservation Plowing
Process in which oxygen chemically combines with another substance, an example of this process is the formation of rust.
Oxidation
Name 2 factors that affect the rate of weathering
Climate and type of rock
A scale used to measure soil acidity
pH scale
A(n) _____, or lack of rain, turned the topsoil to dust.
Drought
In ____ Crop rotation, a farmer plants different crops in a field each year.
Crop Rotation
Breaking down of materials caused by the repeated freezing and thawing of water
Frost action/ Ice wedging
crumbly, dark soil that is a mixture of humus, clay, and other minerals
Topsoil
layer of soil with clay and other particles, but little humus
subsoil
Without plant roots to hold soil in place, _____ erosion occured. This contributed to the formation of an area called the _____
Weathering//Dust bowl
Anything in the environment that humans use is a ______
Natural Resource
Caused by the mixing of rain water with pollutants in the atmosphere
Acid Rain
decayed plant and animal remains
humus
soil made of about equal party clay, sand, and silt
loam
The practice of plawing fields along the curves of a slope is called ______
Contour Plowing
The scratching of rocks caused by particles carried by the wind, water, etc.
Abrasion
organizms that break down animal and plant remains
Decomposer
a measure of how well soil supports plant growth
fertility
_____ is the management of soil to limit its destruction
Soil Conservation