In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage.

Q: Rock begins as magma from a volcano. The magma cools. Crystals form and the magma become igneous rocks. The igneous rocks break down into sediment. Become sedimentary rocks. If subjected to heat and/or pressure from plate-tectonic activity the sedimentary rocks become metamorphic rock. The metamorphic rocks melt. Become magma again.

A: What happens during the rock cycle
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Q: You inhale air through your nose and mouth. The air travels down into your lungs. Oxygen from the air goes into your bloodstream. Oxygen circulates throughout the body due to the heart's pumping. Carbon dioxide travels from the blood into the lungs. Carbon dioxide travels from the lungs up the windpipe. Carbon dioxide is exhaled.

A: Describe the process of breathing.
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Q: Muscles work by expanding and contracting. A muscle fiber gets a signal from its nerve. Proteins and chemicals release energy to either contract the muscle or relax it. When the muscles contracts the bones connected to he muscle are pulled closer together. When the muscle relaxes the bones move farther apart.

A:
How do muscles work?
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