LET US REVIEW Directions: Match column A with column B. Write your answer on a separa sheet of paper A B 1. exosphere a. closest to the Earth's surface 2. mesosphere b. layer of air that extends to 50km from 3. thermosphere Earth's surface 4. stratosphere c. between 50 km and 100km above earth 5. troposphere d. 80 km and 110 above the earth e, the upper limit of the earth f. inner core of the earth​