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.

[EX Q]: Question: When magma reaches the surface through cracks in the earth's crust, what occurs? Answer: volcanic eruption
[EX A]: When magma reaches the surface through cracks in the earth's crust, a volcanic eruption occurs.

[EX Q]: Question: What tissue system has neither dermal nor vascular tissues? Answer: ground tissue system
[EX A]: The ground tissue system has neither dermal nor vascular tissues.

[EX Q]: Question: What are ocean waves mainly caused by? Answer: wind
[EX A]:
Ocean waves are mainly caused by wind.