Answer: Antarctic Eurasian
Explanation: The plate that forms a boundary of the African plate is Antarctic Eurasian and South Amercain
The answer is simple Neptune because it is the only blue planet.
Im not really good with essays,but i can give you an idea.
I think the best way to learn things is to find an interest in it and continue doing some research on it until you have a good understanding of it.Thing like a new sport or experiment