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Soil 2

Published on Nov 18, 2015

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1.

Soil

It's everywhere!
Photo by NASA Goddard Photo and Video
2.

What's in the soil?

  • Rocks
  • Humus
  • Water
  • Air
Photo by chrissam42
3.

What is humus?

  • Dead plants
  • Dead animals
  • Bacteria
  • Nutrients
Photo by NRCS Soil Health
4.

Types of soil

  • Sand
  • Silt
  • Clay
  • Loam (mix of sand, silt, and clay)
Photo by USDAgov
5.

Sand

  • Large rough particles
  • Does not hold water
Photo by massonth
6.

Silt

  • Smaller smooth particles
Photo by Dru!
7.

Clay

  • Smallest flat particles
  • Very smooth
  • Seen only through a microscope
  • Holds water very well
  • If you add water, you can mold it into a flat circle
Photo by qoucher
8.

Types of erosion that creates soil

  • Wind
  • Water
  • Ice
Photo by inkknife_2000 (3 million + views)
9.

Wind

  • Slowly blows bits of rock and creates soil
Photo by jsj1771
10.

Water

  • Slowly breaks off chunks of rock and creates soil
Photo by Javier Medina M.
11.

Ice

  • Water freezes and expands in a rock and causes it to break which then creates soil
Photo by lvanvlee8

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