In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: Which is the best explanation for how air masses move across the United States? Answer: The prevailing westerlies move air masses from west to east across the United States but may be deflected by the jet stream.
The best explanation for how air masses move across the united states is that the prevailing westerlies move air masses from west to east across the united states but may be deflected by the jet stream.

Question: Which side of the heart does blood from the lungs enter into? Answer: left atrium
Blood from the lungs enters into the left atrium.

Question: What type of stratified deposit is formed where lakes are covered by ice in the winter? Answer: varves

Varves type of stratified deposit is formed where lakes are covered by ice in the winter.