Introducing Physical Geography (Wse)

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5 Winds and Global Circulation This chapter considers winds and ocean currents. It examines how unequal surface heating and the rotation of the Earth generate global circulation systems in the atmosphere and oceans. The weight of air and the force of gravity pulling air towards the Earth create air pressure . Air pressure is greatest at the Earth's surface and decreases with altitude. Differences in pressure cause air to move horizontally. This air in motion is called wind . Winds move from areas of high pressure to areas of low pressure. Pressure differences between two places create pressure gradients and the resulting pressure gradient force causes air to move from high pressure areas to low pressure areas. Land and sea breezes are examples of winds caused by pressure differences that result from temperature differences over land and water surfaces. Wind direction is measured by a wind vane, and wind speed is measured by an anemometer. The
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 04/17/2008.

Page1 / 2

ch_05_sum_winds - Chapter 5 Winds and Global Circulation...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online