question: Write a question you would see in a school textbook.
answer: Scientists are concerned about the presence of heavy metals like lead and mercury in the environment because

question: Write a question you would see in a school textbook.
answer: Which of the following best shows the basic three-step energy transformation for a battery-operated radio?

question: Write a question you would see in a school textbook.
answer:
Acid rain has a pH below 5.6. This rain can damage soil, lakes, crops, and buildings. Acid rain is caused by all of the following except