Which is an example of a compare-and-contrast text structure?

Question

Pumice stone is formed when volcanic lava cools and hardens.
Smelting is the process used to remove minerals from rocks.
Silver turns black over time, but there are ways to help prevent this.
Gold and silver are precious metals, but gold is more valuable.

Answer 1

The example that represents a compare-and-contrast text structure is:

"Gold and silver are precious metals, but gold is more valuable."

This sentence compares and contrasts gold and silver by highlighting their similarities (being precious metals) and their difference (gold being more valuable).