When you write anything, you choose your letters from two different alphabets ... big letters and small letters.
The small ones look like this: a-b-c-d-e
The big ones look like this: A-B-C-D-E
The big ones are called "capital letters".
When you have to write a letter and you decide to use the big one, you "capitalize" that letter. It just means that you write it with the big one.
In English, you always capitalize the first letter in a sentence, and the first letter in a name.
There is really no specific answer because there are many types of glaciers and different ways they form.
This is really simple! I recommend doing a drawing, even if you don't have any artistic talent. You can choose any topic, but here's some suggestions: your favorite animal, your favorite location, something you like to do, etc. Draw your topic and/or anything related to it. For the last question something like "I enjoyed having freedom on this assignment because it made it much more fun" would be good!