A Year-Long Trip Around the Sun: Author's Purpose

Why did the author most likely write this passage?

• A.To get readers to buy a product
• B.To tell a made-up ghost story
• C.To teach readers about Earth's revolution around the Sun

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

• A.For example, when the Northern Hemisphere is tilted toward the Sun, it's…
• B.As Earth travels, it tilts on its axis, which is why we…
• C.This constant motion of revolution helps keep our days and nights in…