Oping Clehtific knowledge
Fill in the blanks with the word that best completes each statement.
Scientists develop knowledge by making
about the natural world that may lead to a
scientific question
A scientific question may lead to a(n)
which can be tested.
The results of
can lead to changes in scientific knowledge.
) Intro
Done

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.