C) gravity because gravity compresses the start into the most compact shape possible
the answer is agriculture
The world's tallest artificial structure is the 829.8-meter-tall (2,722 ft) Burj Khalifa<span> in Dubai. The building gained the official title of "Tallest Building in the World" and the tallest self-supported structure at its opening on January 9, 2010.</span>
The subtropical jet streams formate from cool and warm air masses that meet near the equator (close to the 30* Latitude).
