Do I keep the commas or remove them ?

Remove the comma after the word "rocky" because it is unneeded.

Explanation:

So, the sentence will look like this:

"Black Widow and I climbed the steep, rocky trail because we heard there would be free sodas at the summit."

I hope this helps!

B) to demonstrate a lesson about the importance of scientific research
The article focuses on the research done to conclude that the crater formed was due to a meteorite, not a volcano and further goes to mention the other hypotheses drawn from it, such as the craters on the moon. The final few sentences indicate that scientific research is also being done on other events.