fact and question: cycles of freezing and thawing water cause ice wedging
Question: Ice wedging is caused by cycles of freezing and thawing of what?

What's the answer?

answer: h2o

fact and question: the lunar surface contains many craters
Question: The biggest things on the moon are

What's the answer?

answer: craters

fact and question: if some nutrients are in the soil then those nutrients are in the food chain
Question: Soil contains

What's the answer?

answer: chemical substances found in every living thing

fact and question: a battery converts chemical energy into electrical energy
Question: a battery converts chemical energy into electrical energy to power a

What's the answer?

answer:
calculator