The ocean and the Atmosphere are the two large reservoirs of water in the Earth's hydrologic cycle. the two systems are complexly linked to one another and are responsible for Earth's weather and climate. the oceans help to regulate temperature in the lower part of the atmosphere. the atmosphere is in large part responsible for the circulation of ocean water though waves and currents. in this section we first look at how the atmosphere controls weather and climate,and we will explore some the introductory material necessary to understand our upcoming lectures on severe weather