Problem: Generate a sentence that contains a fact.
Sentence: large trees block sunlight from reaching the ground
Problem: Randomly generate a fact.

Random fact: sound can travel through air
Generate a sentence that answers this question: "An electrical conductor is a vehicle for what?".

Answer: An electrical conductor is a vehicle for the flow of electricity
question: What sentence would provide a factual answer to this question: "A mighty river flows through an area for millennia. Afterwards, it can be noted that where there once were shallow rivers, there are now"

answer: most canyons are formed by flowing rivers through erosion over long periods of time
Problem: What is a random fact?

Answer: An example of evaporation is a body of water drying up by absorbing heat energy
Problem: Generate a sentence that contains a fact.
Sentence:
Earth orbiting the Sun causes seasons to change