yes because its a proper noun
Ottawa. Be sure to always capitalize the first "o".
Yes, "Arctic Ocean" should be capitalized because it is a proper noun referring to a specific body of water.
ocean
Ocean is something that is blue and starts with an "o."
Yes, because it is part of the name. It should be Pacific Ocean.
octopus
No, o nly the letter g. It should be God.
Capitalize o nly S i n the word Swiss because it is a proper nou n. It should be Swiss border.
No, "ten o' clock" should not be capitalized unless it is at the beginning of a sentence.
Well, it depends on how you're using it: If you say, "That peninsula in Pennsylvania is large," then no, it is not. But if you say something like, "The Pennsylvanian Peninsula is large," then yes, it is. If it is part of a name, then consider it proper. Kind of like ocean, because you would capitalize the ocean in "Pacific Ocean" but you wouldn't capitalize the ocean in "The ocean off of the Pacific," you know?
ocean