Answer:
Its geology is complex, with numerous rock formations of different materials and ages intermingled with one another.
The DHS incorporates several dozen offices and agencies, many of them previously assigned to other departments and some entirely new. They include the U.S. Coast Guard (USCG), U.S. Secret Service (USSS), Federal Emergency Management Agency (FEMA), Immigration and Naturalization Service (INS), and the newly created Transportation Security Administration (TSA).
Explanation:
the answer is a c b d because that is the way they are arranged
