### process | erosion:

Soil erosion
* Most soil erosion is caused by removals
  - vegetation removals
  - just soil movement
* Some soil erosion is natural, and some is the result of human activities
  - reduces productivity
* affects cropland productivity and water quality.
* begins with a drop of water blasting, like a small bomb, soil particles
  - the first raindrop
* can also affect soil test results
  - carry sediment to surface water, degrading water quality
  - contribute phosphorus to rivers
  - expose the roots of plants
  - leave the roots of plants exposed
  - occur as well, exposing risks of landslide phenomena
  - remove soil , leaving a thin layer or rocky soil behind
* causes crop yields to decrease
  - more damage than floods
* claims over a billion acres cropland annually around the globe.
* harms farm and grazing lands and increases flooding and desertification.
* has consequences
  - effects
* increases as the length of time between burning and spring green-up is increased
  - drastically when exotic weeds replace native grasses
* intensifies with the increasing pace of the water.
* introduces soil and mineral particles to surface water.
* is also widespread.
* is an effect of the shortage of minerals available to support the soil organisms
  - externality problem
* is caused by deforestation and farming
  - disturbance of a land surface
  - wind
  - common in southwestern arid and semi-arid park lands
  - excessive, and there are signs of climate change
  - just one form of soil degradation
  - measured by sediment accumulation near the fence
* is one form of soil degradation
  - of our worst environmental problems
* is one of the leading causes of water pollution in the United States
  - many ways degradation occurs
  - selective, with finer and less dense particles preferentially moved
  - serious, floods and debris flows occur often in summer
* is the major cause of soil degradation
  - threat to stream water quality and fish life
  - most detrimental aspect of agriculture
  - movement of fine soil particles by wind and water
  - physical process of wind or water picking up and removing soil particles
  - single greatest threat to water quality
  - twice that of food-crops since no weeds grow in tobacco fields
* is when dirt particles move around due to the weather and elements
  - the soil is washed or blown away by water or wind
* major component of the desertification in the region
  - contributor of phosphorus to streams
  - environmental problem throughout the developing world
* makes the water cloudy with sediment.
* natural process, part of the gigantic cycles of minerals
* naturally occurring process on all land
  - that affects all landforms
* occurs in the production of all crops
  - mainly when land is exposed to wind and rain through loss of vegetative cover
  - naturally, but is also the result of land changes caused by people
* process that occurs naturally at a slow rate.
* related issue that affects water quality and a farm's productivity.
* removes the productive layer of topsoil, reducing crop yields and land value.
* serious environmental concern.
* serious problem in production agriculture
  - the Semiarid Plains
* widespread problem in rural and urban Queensland.
+ Erosion
  * Erosion can cause problems that affect humans. Soil erosion, for example, can create problems for farmers. Soil erosion can remove soil, leaving a thin layer or rocky soil behind. Erosion can also cause problems for humans by removing rocks or soil that support buildings.

Tillage erosion
* has movement.
* involves movement
  - slope movement