Q: Fact: no light shines through an opaque object
Question: A brick wall stops

A: lumens

Q: Fact: magnetism can cause objects to repel each other
Question: Two iron bars that are similarly charged will likely

A: shove each other

Q: Fact: photosynthesis makes food for the plant by converting carbon dioxide, water, and sunlight into carbohydrates
Question: Which of the following is never an element used to make carbohydrates for the plant?

A: sand

Q: Fact: humans cause pollution
Question: Most of the pollutants in the air and in our world are there due to

A:
man made reasons