Lecture 2 Soil Basics

Lecture 2 Soil Basics - Soils and Soil Science Perspective...

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1 Soils and Soil Science Earth Radius: 4000 miles Surface area: 200 million mi 2 Oceans: 140 million mi 2 Land: 60 million mi 2 Perspective When was it determined that the earth was round? Circumference: 25,048 mi (25,000 mi) When was the circumference first calculated? 1492?
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2 1492 , constructed one of the first terrestrial globes, still preserved at the Nuremberg National Museum Martin Behaim The Round Debate Pythagoras 525 B.C. philosophical: the sphere is the perfect shape Aristotle 350 B.C. New stars, ships, lunar eclipse Eratosthenes 240 B.C. Calculated the earth’s diameter Physical Proof: 1522 Average ocean depth? Average soil depth? Earth’s radius = 4000 miles
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3 Soils: meters thick The interface, the first point of contact, between the earth’s surface and the external environment. Arcanum Arcanum Mysterious knowledge known only to the initiated ? What is Soil? What is Soil?
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4 What is Soil? What is Soil? It is not Dirt What is Soil? What is Soil?
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Lecture 2 Soil Basics - Soils and Soil Science Perspective...

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