Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Gravity makes soil and rock particles move gradually down the slope during each thaw.

Output: What makes soil and rock particles move gradually down the slope during each thaw?


Input: Consider Input: Constructive forces type of forces are involved when deposited rock forms deltas or barrier islands.

Output: What type of forces are involved when deposited rock forms deltas or barrier islands?


Input: Consider Input: An animal produces polyclonal antibodies after exposure to a microbial antigen.
Output: What are the antibodies an animal produces after exposure to a microbial antigen?