question:
An engineer constructs a prototype from wood. Which of the following is the best tool for the engineer to use to make the prototype's surface smooth?

answer:
sandpaper

question:
The Periodic Table of the Elements is arranged so that elements with similar characteristics are in the same column. Which element is a highly reactive metal?

answer:
magnesium (Mg)

question:
The source of energy for the Earth's water cycle is the

answer:
Sun's radiation

question:
Which is an example of a chemical reaction?

answer:
nails rusting