There are four important warning signs that should prompt you to talk to a health care provider. 1  Pain. Pain from arthritis can be constant or it may come and go. 2  Swelling. Some types of arthritis cause the skin over the affected joint to become red and swollen, feeling warm to the touch. 3  Stiffness.
There's a whole lot of water on Earth! Something like 326,000,000,000,000,000,000 gallons (326 million trillion gallons) of the stuff (roughly 1,260,000,000,000,000,000,000 liters) can be found on our planet. This water is in a constant cycle -- it evaporates from the ocean, travels through the air, rains down on the land and then flows back to the ocean.
The volume of water in the oceans is enormous: 1.37 billion cubic kilometers (1.37 Ã 10 9 km 3, or 0.328 Ã 10 9 mi. 3). 1.37 Ã 10 9 km 3. Ocean and Oceanography. Microsoft Encarta. The world ocean covers 71 percent of the earth's surface, or about 361 million sq km (140 million sq mi).he average depth of the oceans is 2.5 miles (4 km). The deepest point lies in the Mariana Trench, 6.8 miles (10.9 km) down. By the way in comparison, Mount Everest is only 5.5 miles (8.8 km) high.