Q: Which action forms a different chemical substance? ----

A: burning a piece of wood

Q: Rocks are classified as igneous, metamorphic, or sedimentary according to ----

A: how they formed

Q: 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? ----

A: sandpaper

Q: The ratio of an object's mass to its volume is its ----
A: density.