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.
How many oceans are there? There are 5 oceans: The Atlantic Ocean; The Pacific Ocean; The Arctic Ocean; The Indian Ocean; The Southern Ocean; How Many Oceans Do We Have. Historically, there are four oceans: Atlantic, Pacific, Arctic, and Indian. These oceans are recognized by almost all oceanic organizations around the world. It is the standard classification that is held by National Geographics. Technically, there is only a single ocean: the world ocean.