How common is radon exposure, science homework help

Option 2: Write and submit a short essay response to the following questions:

How common is radon exposure?
Why are radon tests sometimes required before the sale of a house?
If your neighbor’s house showed low levels of radon would you still need to test your house? Explain.
How can you determine if you have elevated levels of radon in your home?
Radon is a gas, should drinking water be tested? Why or why not?
Why does the EPA suggest multiple short-term tests for radon in your house?
How can you reduce radon levels in your house?
What are radioactive decay and “half-life”?
Are there some areas/regions that have a higher risk of radon exposure than others?

Your response should be a minimum of 250 words in length and must be completed by the deadline for the unit