Transcript of "Soil Is The Geologist S Word For Dirt"
<ul><li>Soil is the loose covering of broken rock particles and decaying organic matter, called humus, overlying the bedrock of Earth’s surface. </li></ul>
<ul><li>Soil contains approximately </li></ul><ul><li>45 % mineral </li></ul><ul><li>25 % water </li></ul><ul><li>25 % air </li></ul><ul><li>5 % organic matter </li></ul>
<ul><li>1. Parent Rock is the original rock which is broken down. The parent rock contributes the type of minerals found in the soil . </li></ul>
<ul><li>Climate may be the strongest factor effecting climate. </li></ul><ul><li>Temperature and precipitation will determine whether chemical or mechanical weathering will take place. Along with the type of plant and animal life present. </li></ul>
<ul><li>The primary source of organic matter in soil is plants, but animals also contribute. When organic matter is decomposed important nutrients are supplied to the soil. </li></ul>
<ul><li>The actions of microorganisms like fungi and bacteria and animals such as earthworms and moles, mix and move the soil and add to the enrichment process of forming the soil. </li></ul>
<ul><li>The slope of the land can influence the moisture and erosion of soil. </li></ul><ul><li>Steep slopes are often poorly developed because water is being run off and with no plant growth the erosion process quickens </li></ul>
<ul><li>In contrast, poorly drained low lying areas can be thick and dark It can be too wet and also have a lack of oxygen develop into a fertile soil. </li></ul>
<ul><li>It takes 100 years to form 1 inch of soil. The longer a soil has been forming, the thicker it becomes and the less it resembles the parent material. </li></ul>
<ul><li>The vertical differences, which become more pronounced as time passes, divide into zones or layers known as horizons. </li></ul><ul><li>This is called the soil profile. </li></ul>
<ul><li>There are 3 major divisions in the soil profile. The top is the A layer. High organic matter and humus are found here. </li></ul>
<ul><li>Soil layer B is enriched with clay minerals. Many subsoils have a zone of accumulation consisting of soluble minerals that have been leached or washed out from the topsoil. They can be red or brown in color as a result of the presence of iron oxides. </li></ul>
<ul><li>Layer C is directly above the parent rock or bedrock. This layer contains weathered parent material and no organic material. </li></ul>
A particular slide catching your eye?
Clipping is a handy way to collect important slides you want to go back to later.