Final answer:
The pressure changes between the Pacific Ocean and the Indian Ocean that cause great changes in wind and rainfall are caused by Walker Circulation.
Step-by-step explanation:
The pressure changes between the Pacific Ocean and the Indian Ocean that cause great changes in wind and rainfall are caused by Walker Circulation. Walker Circulation is a large-scale atmospheric circulation pattern that is driven by the temperature gradient between the eastern and western Pacific Ocean.
In the Walker Circulation, warm air rises over the western Pacific, causing low pressure and rainfall. The rising air then moves eastward at upper levels of the atmosphere, creating a high-pressure area in the eastern Pacific. This circulation pattern influences the development of phenomena like El Niño and La Niña, which are responsible for global changes in temperatures and rainfall.