The process of rock breaking apart is called weathering. Some examples of weathering include streams cutting through rock to form canyons, rocks splitting when water seeps in and freezes, and windblown sand raking down rock. Erosion is the picking up and carrying away of the weathered rock. An example of erosion is moving water picking up pieces of rock or soil and moving them.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.