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Soils: One of Our Natural Resources!
Some call it dirt…..But it is Soil !!! Soil is made of loose, weathered rock and organic material.
The rock material in soil contains three noticeable parts: sand, clay, and silt.
Soil, on the average, consists of 45% mineral, 25% water, 25% air and 5% organic matter. This is just an average!
There are thousands of different soils throughout the world. Five important factors influence the specific soil that develops.
Parent Material This refers to the minerals and organic materials present during the soils formation.
Parent Material Materials from volcanoes, sediment transported by wind, water, or glaciers are some examples.
Think about the soils in our area. Where do you think our parent material came from?
Our parent material is mainly Marine sediment (ocean in origin), or produced by steam-river action. It may be thousands of feet deep!
Climate The climate of a particular region can have a major influence on the rate of soil formation.
Climate Weathering processes like the cycles of freezing and thawing, along with wetting and drying vary with each region.
Living Organisms Both plants and animals help create soil.
Living Organisms As they die, organic matter incorporates with weathered parent material and becomes part of the soil.
Can you think of some organisms that might help mix and enrich the soil?
Living Organisms The actions of moles, earthworms, bacteria, fungi, and round worms mix and enrich the soil.
Topography The slope or hilliness of a region can have a major influence on the moisture and erosion of soils.
Topography In many regions, moist, poorly drained soils are located in low areas.
Topography Drier, well drained soils are often found in sloping hillsides. Erosion is often a problem here and can lead to lose of topsoil.
Time It takes hundreds of years to form one inch of soil from parent material.
Time Only the top few centimeters are productive in the sense of being able to sustain plant growth.
Time soil conservation This is why soil conservation is so important!
Soil Profile In a cross-section of soil, various zones are formed.
O Horizon: Organic Layer It consists of leaf litter and other organic material lying on the surface of the soil.
A Horizon: Topsoil This layer is usually loose and crumbly with varying amounts of organic matter.
A Horizon: Topsoil This is generally the most productive layer of the soil. Conservation efforts are focused here!
B Horizon: Subsoils Subsoils are usually lighter in color, dense and low in organic matter.
C Horizon: Transition This layer of transition is almost completely void of organic mater and is made up of partially weathered parent material.
Bedrock Below the C horizon the unweathered bedrock will be found.
What would happen to land based life as we know it, if there was no soil layer?
Soils: One of Our Natural Resources!. Some call it dirt…..But it is Soil !!! Soil is made of loose, weathered rock and organic material.
Weathering and Soil Formation. Importance of Soil Soil is one of Earth’s most precious resources. It provides the support and nourishment that plants.
Soil is the lose covering of rock particles and decaying organic matter(humus) Results from both physical and chemical weathering.
Soil Formation. Soil FormationVocabulary Humus Humus Horizons (A, B, C, R) Horizons (A, B, C, R) Soil Profile Soil Profile Litter Litter Leaching Leaching.
SOIL AS AN ECOSYSTEM INTRODUCTION TO SOILS FIELD STUDY What do we know about soil now? What makes up soil? What lives there? Where does soil come from?
The Nature of Soil Soil- a mixture of weathered rock, decayed organic matter, mineral fragments, water and air.
Soil Chapter 8. Soil Characteristics Most soils contain four basic components: Organic matter Mineral particles Water Air.
12.2 Soil Key Ideas: Soil is made of weathered rock and organic material. Climate and other factors affect the composition of the soil.
The Nature of Soil Chapter 7, Section 2. The Formation of Soil What is Soil? Mixture of weathered rock, decayed organic matter, mineral fragments, water,
Unit 1 Lesson 5 Soil Formation Copyright © Houghton Mifflin Harcourt Publishing Company.
The Nature of Soil Essential Question: What are the characteristics of soil? How does the composition of soil vary?
Man, despite his artistic pretensions, his sophistication, and his many accomplishments— owes his existence to a six-inch layer of topsoil and the fact.
Soil Profile Linda Giorno Fall What is the difference between soil and dirt? Dirt is what you find under your fingernails. Soil is what you find.
Soil is made of loose, weathered rock and organic material.
Do Now 10/8/13 1.Which type of crust is more dense? 2.What type of luster would a diamond have? 3.List four agents of erosion. 4.What is deposition?
How Is Soil Formed? Have you ever squished your toes in a muddy garden?
DO Now: You find a sedimentary rock that has one graded bed. Describe how you know which layer of the graded bed is formed last?
How Do Soils Form?. Stop treating your soil like DIRT! Soil is a much more complex living thing than most people realize. All the mineral soil on earth.
Soil The product of weathering of rocks
SOIL … It’s more than just dirt! Learn all that you ever wanted to know about the stuff beneath your feet.
SOIL PROFILE A vertical strip of soil stretching from the surface down to the bedrock and including all of the successive soil horizons.
SOIL AND NATURAL VEGETATION Physical Geography. Soil Soil is made up of 4 main parts: Minerals Organic and Bacterial materials Moisture Air Think.
Section I The Nature Of Soil Ms. Scerra. Formation of soil can take thousands of years can take thousands of years.
Soil Soil is made of A. weathered rock/ sediments B. humus- decayed plant and animal matter C- living organisms- (worms, fungi and insects)
What Is Soil Made Of? Soil begins to form when bedrock is broken apart into small pieces of rock and minerals. Rain, ice, wind, freezing, and thawing.
External Forces That Shape the Earth. Weathering Weathering refers to physical or chemical processes that change the characteristics of rocks. Sediment.
Soil An important product of Weathering. Soils Weathering produces a layer of rock and mineral fragments called – Regolith Soil – The part of regolith.
Soils Characteristics Texture Soil Profile Soil Types Threats to Soil.
Soils Earth’s Changing Surface. Review Weathering – breaks down rock –Mechanical –Chemical Erosion – removes the rock particles.
What Is Soil? The four components of soil: Decomposed rock Humus Air Water Soil is the layer of rock and mineral fragments along with organic matter,
SOIL DEVELOPMENT AND EROSION. Soil Soil is a combination of mineral and organic mater, water, and air Soil is a combination of mineral and organic mater,
Soil and Soil Conservation. Soil is made up of weathered rock and decayed parts of plants and animals (organic material), mineral fragments, water,
What is the composition of soil?. Essential Question: How is soil formed? Standard: S6E5h. Describe soil as consisting of weathered rocks and decomposed.
Weathering and Erosion Section 3 Section 3: Soil Preview Key Ideas Soil Soil Characteristics Soil Profile Soil and Climate Soil and Topography.
Understanding Soil Formation Mr. Pullom Fall 2011.
Soil Formation and Composition. I. Soil Formation –A. When bedrock is exposed, it weathers. –B. Particles of rock mix with other material. –C. Soil.
UNIT C. Basic Principles of Agricultural/Horticultural Science.
HOW SOIL FORMS 6.E.2.3 Explain how the formation of soil is related to the parent rock type and the environment in which it develops.
Soil Chapter 12 Section 1. What is Soil? Renewable resource that can be replaced over LONG periods of time. 100’s or 1,000’s of years for just 1 inch.
Ch. 8 Weathering and Soil Formation. Section 2: How Soil Forms What is Soil? – Soil is the loose, weathered material on Earth’s surface in which plants.
Welcome to Science 11/21/11 Open your book to page 255 and get your notes out for Ch. 10. Today’s Schedule 1. Review Sections 1 & 2 2. Question of the.
Weathering of Rocks Hoodoos More Resistant layer.
WHAT’S IN THE SOIL? And why is it important?. Sand Drains well but can not hold onto nutrients. Sand is a large particle. Form lightweight, free-draining.
The Nature of soil. Dirt is what you find under your fingernails. Soil is what you find under your feet. Think of soil as a thin living skin that covers.
G2-2 Soil Formation and Composition EQ: How do you scientifically describe soil? How is soil formed?
Do Now In your own words, describe what soil is and what it’s made up of.
The loose, weathered material on Earth’s surface in which plants can grow.
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