What is a polar vortex? *
A) The atmospheric effect of everyone in a region opening their freezers at once
B) A constant ice storm that only affects certain regions
C) Low-pressure zones at each pole of the earth

The first supersonic flight was 1947. it was just above the speed of sound. which altitude would you expect captain yeager to have used for his flight? a) sea level b) 1000m c) 13,700m (within altitude used by commercial planes today) d) 85,000m (where meteor showers originate) will mark brainlist