Why is ground speed different to air speed?

Related questions

1. Do airplanes have speed limits?
2. What is the unit of speed?
3. Why do planes fly faster at higher altitudes?
4. Do planes use knots?
5. Is speed same as ground speed?
6. Why does TAS increase with temperature?
7. Why is boat speed in knots?
8. What is kts flight speed?
9. What speed do airplanes land at?
10. What is IAS speed?

Tags

1. #aircrft
2. #difference
3. #speed
4. #ground
5. #going
6. #thorugh
7. #100mph
8. #aircraft
9. #direction
10. #moving
11. #airspeed
12. #50mph