Question

Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. (2) A greenhouse stays warm because sunlight and heat coming through the glass roof are mostly trapped. (3) The heat doesn't radiate back into the atmosphere because it's held in by the glass. (4) Something like that happens on Earth. (5) The atmosphere acts like a blanket that keeps the Sun's heat from leaking away into space.
Which sentence is the paragraph's topic sentence?

Answer 1

The topic sentence is the first sentence. It defines what the rest of the paragraph will be. <span />

Answer 2

Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere because it's partly trapped by the glass. Something like that happens on Earth. The atmosphere acts like a blanket that keeps the Sun's heat from leaking away into space. 



8. In the first sentence, the phrase what's called the greenhouse effect presents a/an