Question

what are the percentages of sand, silt, and clay in soil with a texture indicated by the red square in the figure above?

Explanation:

Step1: Locate the red - square area

The red - square is in the "Silty clay loam" region.

Step2: Read the percentages

By looking at the axes:
Percent sand: 30%
Percent silt: 50%
Percent clay: 20%

Answer:

Sand: 30%, Silt: 50%, Clay: 20%