سؤال قراءة ستيب محلول — الفكرة الرئيسية (تدريب 8146)

1. The oceans make up 70 percent of the planet and contain 97 percent of all the water on Earth. It also makes up the vast majority of water stores, the majority of the planet's moisture, terrestrial energy, and heat from the sun. This energy is transferred between the equator and the two poles by larger surface currents, by winds and deep ocean currents driven by differences in ocean density. It also provides the moisture and energy for storm systems and ultimately global climates. 2. As terrestrial creatures, humans think of the importance of the planet's land surfaces, yet Earth is a planet consisting of 70 percent water. From space, the dominance of water is obvious because most of it is stored in Earth's oceans. 3. Earth would not be the same planet without its oceans. The oceans, along with the atmosphere, keep Earth's surface temperatures fairly constant worldwide. Some places on Earth reach as cold as -20 degrees Celsius, whereas other places reach as hot as 55 degrees Celsius. Yet on other planets like Mercury, temperatures range from -180 degrees Celsius to 430 degrees Celsius.