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Across 1. the art of staying aloft by exploiting the energy of the atmosphere 3. fluid motion between regions of unequal heating 7. usually a singe-engined airplane that pulls a glider 8. waving action with strong up and down motions across a mountain 11. measure of the thermal energy of the atmosphere (degrees C) 12. the atmosphere's resistance to vertical motion

Down 2. mathematical relationship between glide distance and altitude loss 4. measure of the amount of force per unit area on the atmosphere (PSI) 5. a column of air that moves upward 6. average rate at which temperature decreases with an increase in altitude 9. the height or distance above ground or sea level 10. mass per unit volume