All About The Dirty Life

Weathering, Erosion, Deposition, & Soil


Weathering is the breaking into smaller pieces (sediments). Weathering occurs when rocks are exposed to the atmosphere, hydrosphere, and other natural agents (plants, animals)

Three types of weathering

Physical Weathering

  • This means the rocks fall apart into smaller pieces.

    This causes rocks to disintegrate.

Physical weathering causes rocks to disintegrate in situ. This happens when there are changes in temperature over a short period of time. The temperature needs to be fluctuating.

Two types of physical weathering


  • Freezing is when water becomes ice. Thawing is when ice turns to water. Freeze-thawing weathering occurs when the temperature keeps fluctuating above and below 0 celsius.


  • This is when pieces of the outer layer of rock breaks away. This happens in places where there is a very big difference in temperature between the night and day.

Chemical Weathering
  • This means the minerals that make up the rock are changed by a chemical reaction. When rocks are made of minerals that react with H2O, CO2, and O2 in the environment this is called chemical weathering. This causes rocks to decompose. Dead plants can cause chemical weathering.

Biological Weathering
  • This is when plants cause rocks to break up. The roots of plants cause rocks to disintegrate. The roots can grow through cracks in rocks to find groundwater.
Weathering and Erosion: Crash Course Kids #10.2


Erosion is the movement of sediments.

Agents of Erosion (5)

Gravity, Running water (rivers, streams), Glaciers, Wind, and Waves


Deposition is the laying down or setting of eroded material.

Soil composition

Soil composition is an important aspect of nutrient management. While soil minerals and organic matter hold and store nutrients, soil water is what readily provides nutrients for plant uptake.

How is soil used?

  • Soil lets plants grow, allows gas exchanges to happen between the land and air, provides habitat for most of the organisms on Earth, holds and cleans water, recycles nutrients, and is used for constructing structures like buildings and roadbeds.

Why is it important in North Carolina?

  • In North Carolina, we do a lot of farming so we need soil and without it, we would not have any plants like vegetables or fruits.
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What type of soil is found in North Carolina?

Cecil Soil

  • Cecil soil is a type of deep, well-drained soil found on the slopes and ridges of the Piedmont region. This soil is formed from weathered felsic, igneous and metamorphic rock. Over half of the Cecil soil in North Carolina is cultivated for growing crops such as corn, tobacco and cotton. The other half is used for pastures and forestland. Cecil clay, a fertile red clay soil containing decomposed granite and quartz.

Sandhill Soil

  • Sandhill soil is a loose, gray sandy soil, commonly found in the Coastal Plain region of North Carolina. Oftentimes, the top layer of this soil is bleached white with underlying layers ranging in color from brown to reddish-brown. Because sandhill soil is low in organic matter and very dry, it is not well suited for agriculture.

Organic Soils

  • Organic soils are typical in wetland areas such as marshes, swamps' and bogs. Organic soils form in areas where high rainfall and poor drainage allow organic matter to collect over time. Organic soils are mostly in the tidewater and lower coastal regions of the Coastal Plain, although they can be in almost any area of the state. Organic soils are often black and mucky and contain high amounts of peat, which is partially decomposed vegetative matter.

soil conservation methods

Crop Rotation

Crop rotation was used to increase the nutritional value of the food and kept the nitrogen levels of the soil sufficiently high so that chemical fertilizers were not even a consideration. Crop rotation even fed livestock sufficiently. Depending on the region where food is being grown, crops are rotated: climate, rainfall and the starting quality of the soil are taken into consideration.
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Kelly Gomez

My name is Kelly Gomez-Garcia. I was born in Whiteville, NC. I am only 15 years of age. I have only one sister, her name in Kaydy. I currently live in Whiteville.