Are We Still At Risk?

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# Are We Still At Risk? - PowerPoint PPT Presentation

Are We Still At Risk?. Washington State, 2009. Kansas City, 2004. “ We might say that the earth has the spirit of growth; that its flesh is the soil .” -- Leonardo da Vinci . Space Ship Earth. The Big Picture. Simple Math Tells the Story : 197 million sq. miles = Earth's surface area

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Are We Still At Risk?

Washington State, 2009

Kansas City, 2004

“We might say that the earth has the

spirit of growth; that its flesh is the soil.” -- Leonardo da Vinci

Space Ship Earth

The Big Picture

Simple Math Tells the Story:

• 197 million sq. miles = Earth's surface area
• 45 million sq. miles is Exposed Land (23%)
• 12 million sq. miles is Arable Land (6%); that's 7.68 billion acres (1 mile = 640 acres)
• 5 million sq. miles under cultivation (2.5%); that's 3.20 billion acres
• 7 Billion People(7,000,000,000)
• 1.10 acres of arable land for each person
• 0.46 acres of land under cultivation for each person

Is this your acre?

Or, This?

Soil Formation
• Soil formation is dynamic and affected over time by:
• Climate
• Topography
• Parent Material
• Macro- and Microorganisms

“Most of all one discovers that the soil does not stay the same,

but, like anything alive, is always changing and telling its own story.

Soil is the substance of transformation.”

-- Carol Williams

DYNAMIC! A very important point in dealing with correcting soil problems!

Topsoil

A:

Subsoil

B:

Horizons

Parent Material

C:

Bedrock

D:

Soil Layers

It's Like a Layer Cake

Horizons

Upper Mantle, Lower Mantle, Outer Core, Core,

Giant Mushrooms, Dinosaurs, Arne Saknussemm, etc.

Topsoil

A:

Subsoil

B:

Parent Material

C:

Bedrock

D:

Soil Formation:

Organic

O:

What’s Up Goes Down

Desert Soil: No Organic Layer

Topsoil

A:

Subsoil

B:

Parent Material

C:

Bedrock

D:

Soil Formation:

Organic

O:

What is Limestone?

pH

pH

pH

pH

Limestone

Limestone

Calcium Carbonate: CaCO3

Crystalline form of Calcium Carbonate

What’s Down Goes Up

Soil Formation:

Aeolian (Eolian) Soil: deposited by wind

Alluvial Soil: deposited by water