Studying the Salty Seas: Author's Purpose

Why did the author most likely write this passage?

• A.To teach readers about the oceans and the scientists who study them
• B.To get readers to buy a product
• C.To tell a made-up ghost story

Authors use examples to explain their ideas. Which sentence from the passage gives an example?

• A.Understanding these processes helps us learn more about our Earth and its…
• B.Scientists called oceanographers explore how ocean currents, tides, and waves work.
• C.For example, they study how warm water from the equator moves toward…