Answer:
I plow and plow but never sow.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
What has a bottom at the top?
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
Why was the cook arrested?