The key idea is found in the first sentence: The temperature of ocean water changes more slowly than that of the air; therefore, the oceans affect the world's climate.

A screw is a simple device. It has been used for centuries as a means of lifting water out of wells and over the banks of irrigation canals. A screw consists of a single continuous spiral wrapped around a cylinder.
The threads are cut into a rod in a spiral and make it possible to use the holding power of the screw in fastening objects together.

The two basic types of oscillators used in microwave installations are the klystron and the magnetron.