How do scientist been able to understand the internal structure of earth

Articles of the confederation is a good representation of a system of government.

Restricting immigrants from entering a country may be based on what belief?  

The passage below can be revised to make it more concise. which word is a modifier that can be eliminated because it adds no meaning? dr. madison is somewhat skeptical about stories of global warming. she has gathered scientific data in remote areas to prove her position. somewhat global scientific remote