Baby steps to writing well

Writing practice … [Answer in 4 to 6 sentences each]

a. Why doctors and nurses in hospitals wear white aprons?
b. Why diesel engines are preferred to steam engines for hauling trains?
c. Why eating cut fruits from street vendors is not a good idea at all?
d. Why do mountaineers carry oxygen cylinders?
e. Why are CCTV cameras installed in public places?
f. Why do empty ships carry a good quantity of sea water?
g. Why do onion prices skyrocket and crash sometimes?
h. Why do some farmers commit suicide?
i. Why is an aluminum plate embedded to the bottom of a stainless steel pressure cooker?
j. Why have oil prices crashed in recent months?

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First 200 responses will be evaluated.