A student placed a stack of rocks on a ramp. She added clumps of soil rooted with live grass. Using a garden hose, she then applied a steady spray of water that soaked into the soil, making it heavier. What does the student's experiment model?
A- The role of roots in biological weathering
B- The role of humans in glacial melting
C- The role or raindall in mass wasting
D- The role of chemical agents in erathering of rock
