omar observes that many buildings in his city were built using limestone. he has read that acid rain can…

omar observes that many buildings in his city were built using limestone. he has read that acid rain can damage limestone. he also knows that limestone reacts with acids and that chemical reactions are affected by temperature. with this in mind, he conducts an investigation to see how the amount of damage to the limestone is affected by the amount of acid on the stone. which statement describes the correct plan for his procedure? the temperature and the amount of damage to the limestone are controls. the amount of acid and the type of limestone are variables. the temperature and the type of limestone are controls. the amount of acid and the amount of damage to the limestone are variables. the amount of acid and the type of limestone are controls. the temperature and the amount of damage to the limestone are variables. the amount of acid and the amount of damage to the limestone are controls. the type of limestone and temperature are variables.

omar observes that many buildings in his city were built using limestone. he has read that acid rain can damage limestone. he also knows that limestone reacts with acids and that chemical reactions are affected by temperature. with this in mind, he conducts an investigation to see how the amount of damage to the limestone is affected by the amount of acid on the stone. which statement describes the correct plan for his procedure? the temperature and the amount of damage to the limestone are controls. the amount of acid and the type of limestone are variables. the temperature and the type of limestone are controls. the amount of acid and the amount of damage to the limestone are variables. the amount of acid and the type of limestone are controls. the temperature and the amount of damage to the limestone are variables. the amount of acid and the amount of damage to the limestone are controls. the type of limestone and temperature are variables.

Answer

Brief Explanations:

In a scientific investigation, controls are kept constant and variables are what are being tested or measured. Omar wants to see how the amount of damage to limestone is affected by the amount of acid. So, the type of limestone and temperature (since he knows they can affect the reaction but he's not testing them here) should be controls. The amount of acid is what he's changing (independent variable) and the amount of damage to the limestone is what he's measuring (dependent variable).

Answer:

The temperature and the type of limestone are controls. The amount of acid and the amount of damage to the limestone are variables.