Question

multiple choice question
what are relict sediments?

the type of sediments that no longer exist

sediments deposited on continental shelves when they were not underwater (but now are)

the types of sediments that represent an environment that no longer exists anywhere on earth’s surface

the sediments that now are lithified into rock layers

Explanation:

Relict sediments are sediments that were deposited in an environment that has since changed. Continental shelves were once exposed (not underwater) during lower sea levels, and sediments deposited then are now relict as the shelves are underwater. The first option is wrong as relict sediments still exist. The third option is incorrect as the environment (continental shelf exposure) can still occur elsewhere in a cycle. The fourth option is about lithification, not relict sediments.

Answer:

B. Sediments deposited on continental shelves when they were not underwater (but now are)