Which word refers to an action of at least two persons? a. collusion b. cuisine c. somnambulate d. vestment

A, collision because you need 2 people to collide to have a collision not only one thing/person.

To form soil, the two processes which must occur are erosion and weathering, so the correct answer is "soil formation is a continuous presses, but also one which takes a long time, it can sometimes take more than five hundred years for 1cm of soil to form.

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