TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: All solutions contain at least how many substances? Answer: two

SOLUTION: All solutions contain at least two substances.

PROBLEM: Question: In science, what is supported by much evidence, widely accepted by credible scientists, and unlikely to be disproved? Answer: theory

SOLUTION: In science, theory is supported by much evidence, widely accepted by credible scientists, and unlikely to be disproved.

PROBLEM: Question: When sediments settle out of water, what do they form? Answer: horizontal layers

SOLUTION:
When sediments settle out of water, they form horizontal layers.