Is it "manmade", "man made", or

"man-made"?

Man-Made

Maria is almost correct. If she hadn't used capital letters, she'd have been 100% correct!

man-made

You can always look these things up in a good dictionary, online or in print:
http://www.dictionary.com/browse/manmade?s=t

The correct spelling is "man-made," with a hyphen between "man" and "made." When encountering a question of spelling or grammar, it's often helpful to refer to a reliable language resource, such as a dictionary, to confirm the correct usage. In this case, you can consult a dictionary to see how the compound adjective "man-made" is spelled. Additionally, you can search for examples of usage in books or websites to see how it is commonly written. These resources can provide clarity and help ensure that you are using the correct spelling and grammar in your writing.