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.
There are about 1,360 million cubic kilometers (326 million cubic miles) of water on Earth. Most of this water is stored in reservoirs such as the oceans, in glaciers and ice caps, underground, and in the atmosphere. In distinction to other planets in the solar system, sizeable amounts of water on the Earth can be found in solid, liquid, and vapor form.