1. Soil
How much soil is there?

2. How is soil formed?

24. Does soil come in different sizes?

25. Soil sizes:

26. Soil sizes:
Sand: 0.05 to 2.0 mm diameter

27. Soil sizes: Sand: 0.05 to 2.0 mm diameter
Silt: to 0.05 mm diameter

28. Soil sizes: Sand: 0.05 to 2.0 mm diameter
Silt: to 0.05 mm diameter
Clay: < mm diameter

29. What are the layers of soil on top of the lithosphere?

31. Layers of soil (horizons)

32. Layers of soil (horizons)
“O” horizon: top layer of litter (leaves, decaying plants, etc.)

33. Layers of soil (horizons)
“O” horizon: top layer of litter (leaves, decaying plants, etc.)
“A” horizon: topsoil that contains humus and minerals.

34. Layers of soil (horizons)
“O” horizon: top layer of litter (leaves, decaying plants, etc.)
“A” horizon: topsoil that contains humus and minerals.
“B” horizon: subsoil such as clay, loam, or silt.

35. Layers of soil (horizons)
“O” horizon: top layer of litter (leaves, decaying plants, etc.)
“A” horizon: topsoil that contains humus and minerals.
“B” horizon: subsoil such as clay, loam, or silt.
“C” horizon: weathered parent rock and glacial deposits.

36. Layers of soil (horizons)
“O” horizon: top layer of litter (leaves, decaying plants, etc.)
“A” horizon: topsoil that contains humus and minerals.
“B” horizon: subsoil such as clay, loam, or silt.
“C” horizon: weathered parent rock and glacial deposits.
“R” horizon: Un-weathered parent rocks.