Geology Home Page
Roger Weller, geology instructor
by Jessica Redus
What is soil?
Soil is a body with layers
(horizons) made of anything from leaves to rock
particles. The four main layers are O, A, B, and C. The O horizon is made up
of things like leaves and litter. It is really anything on top of the surface.
Horizon A is made up of decomposed organic matter and is also known as top
soil. It is typically very dark due to these organic materials. Horizon B is a layer
consisting of clay and iron oxides and is also called the zone of accumulation
because things from the A horizon that eventually settle down into this horizon.
Horizon C is the last layer of the four; it is made up of particles of rocks.
What is erosion?
Erosion is a mechanical
process that makes something wear by grinding it
down. Thus; soil erosion is the breaking down and wearing out of soil. Soil
erosion is a natural process within the environment, however; certain things
have caused the Earthís soil to erode at an alarming rate. Sometimes soil erosion
can be beneficial to ecosystems at times but for the most part it is harmful and
destructive to the environment.
What causes soil erosion?
Many things can cause soil
erosion. The main factor isnít so much weathering
as it is humans. Humans and other animals have been increasing the soil erosion
around the world. The main causes of soil erosion I will be covering are: wind,
water, ice, fire, gravity, animals, and, of course, humans.