Which type of mechanical weathering are mostly likely represented below

Earth scientists often divide mechanical weathering into two major categories: fracturing, which includes frost- and salt-wedging, and abrasion, such as sandblasting. Rock Abrasion.

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answer; i believe the correct answer to the above question is ( friction)

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products