Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

6 Cards in this Set

  • Front
  • Back

geological erosion

- natural, not human induced

accelerated erosion

- not natural, induced by human activities

- 10 to 1000 times as destructive as geological erosion

about 4 billion Mg of soil is moved annually by erosion in the United States

- 2/3 by water, 1/3 by wind

- somewhat more than half occurs on cropland

- the remainder from range land, timber harvest, construction sites

on-site erosion damage

- lose topsoil

- selective removal of OM, fine particles, nutrients

- remaining soil has lower infiltration rates and water holding capacity

- gullies make equipment operation difficult, undercut roads, buildings

off-site erosion damage

- nutrient and pesticide transport degrades water quality

- sediments

- smother crops and low-lying vegetation

- fill in drainage ways, causes flooding, reduce reservoir capacity, require dredging

- degrade stream beds

- causes turbidity

T value

- maximum amount of soil that can be lost annually by erosion on a particular soil without degrading its long term productivity

- t-values in most agricultural soils in the USA are 5-11 Mg/ha