Answer:
My first is nothing but a name; my second is more small; my whole is of so little fame it has no name at all.
I can be written, I can be spoken, I can be exposed, I can be broken.
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
When set loose I fly away. Never so cursed as when I go astray.
I am your mother's brother's only brother in law. Who am I?