ISA Arborist Certification Chapter 3 - Soil Science questions with correct answers

organic layer CORRECT ANSWER 0 Horizon, an unaltered soil, thin layer of decomposing organic matter Loam CORRECT ANSWER A mix of three different particle sizes and is often considered an ideal soil texture because of the favorable characteristics for plant growth. Not made up of equal mix of sand, silt, clay. Contains less clay Topsoil CORRECT ANSWER commonly known as the uppermost layers (O,A,E, and sometimes the upperpart of B horizon) C Horizon CORRECT ANSWER Deepest Soil layer composed of partially weathered parent material. Soil in this horizon is continually forming. A Horizon CORRECT ANSWER Contains most of the fine absorbing roots of trees and is very biologically active. Rich in organic matter. E Horizon CORRECT ANSWER Between the A and B Horizon, lacks the organic matter as in A, has lighter color due to this. Absorbing Roots CORRECT ANSWER Roots found in the upper 6-10 inches of soil Roots CORRECT ANSWER Few__