I'm trying to keep this descriptive essay in the past tense. I bolded the words of my concern (and italicized the ones I believe are in the right tense) in the following passage:
As a result of the floor containing thousands of small holes, looking down through them yielded the sight of the rushing waters of the Merrimac River. Passing by this intense stream invoked a fear of falling into the violent, rushing waters.
What my question comes down to is: Are those verbs that end in
-ing considered past tense, as well as those ending in
-ed? If not, how should I re-write this passage?