Answer:
The Earth also gives us clues about the levels of greenhouse gases that existed in the past. For example, ancient air bubbles trapped deep in the ice of Greenland and Antarctica reveal how much carbon dioxide was present long ago.
Explanation:I learn it in 8 grade.
Answer:
C. The reader’s comment is not a credible source because nothing is known about the person who wrote the comment.
Explanation:
The farmer wont be able to grow crops because the soil is not usable.
Answer:
yes the asthenosphere can break
