These are the deepest parts of the ocean floor where depths exceed 7000 m. They occur mainly beneath the western Pacific Ocean close to oceanic islands; for example, east of the Philippines and the Mariana Islands is the Mariana Trench, where the deepest known soundings have been made at 11 034 m. This is part of a great line of trenches extending north from the Philippines, along the east of Japan and on to the Aleutians. The bottom is also very deep in the New Britain Trench near the Solomon Islands, and in the Tonga Trench and Kermadec Deep to the north-east of New Zealand. In the eastern Pacific the Peru-Chile Trench lies close to the west coast of South America.
In the Indian Ocean the deepest water has been found in the Sunda Trench south of Java and also in an area south-east of the Cocos Islands. In the Atlantic, water of comparable depth occurs in a pit north-east of Puerto Rico, and a trench near the South Sandwich Islands.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.