How can land affect the flow of water?

The grooves of land can change the direction of water. For instance, if you were to dig a small half-slope in the ground for about 6 feet, and then you pour water in it, the water will follow the way that the trench was dug.

Explanation:

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answer; collective security;

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."