On the average, two tsunamis occur per year throughout the world which inflict damage near the source.

Varicose veins are most commonly found on the legs of women and men who spend a lot of time on their feet. Birth control pills, hormone therapy, obesity, weight fluctuation, and constipation can also add to the development of varicose veins.

Tsunamis are also triggered by landslides into or under the water surface, and can be generated by volcanic activity and meteorite impacts.

No. U.S. coastal communities are threatened by tsunamis that are generated by both local earthquakes and distant earthquakes. Local tsunamis give residents only a few minutes to seek safety. Tsunamis of distant origins give residents more time to evacuate threatened coastal areas but increase the need for timely and accurate assessment of the tsunami hazard to avoid costly false alarms. Thus, U.S.

Anything that rapidly displaces a large volume of water can cause a tsunami. Typically, tsunamis are caused by underwater earthquakes, but landslides, volcanic eruptions, calving icebergs, and (very rarely) meteorite impacts can also generate tsunamis. These types of events can cause large disturbances in the surface of the ocean, and when gravity pulls the water back down, the tsunami is born.

Since earthquakes cannot be predicted, we do not know when a tsunami will happen before the earthquake occurs. Once a large potentially tsunamigenic earthquake does occur, we can forecast tsunami arrival times and wave heights through the use of computer modeling. You can learn more on the NCTR website: http://nctr.pmel.noaa.gov/tsunami-forecast.html

Tsunami velocity depends on the depth of water through which it travels (velocity equals the square root of the product of the water depth times the acceleration of gravity). Tsunamis travel approximately 475 mph in 15,000 feet of water. In 100 feet of water the velocity drops to about 40 mph. A tsunami travels from the central Aleutian Is. to Hawaii in about 5 hours and to California in about 6 hours, or from the Portugal coast to North Carolina in about 8.5 hours.

Since a tsunami consists of a series of waves, the danger can last for many hours. Large tsunamis are generally recorded for a few days following the event.

No such event has ever occurred in living memory. Nonetheless, there is an early warning system. In any case, country properties on Santa Maria are never found less than 110 yards (100 metres) above sea level.

This is a natural process. If it occurs more often, with equal or bigger icebergs, perhaps then we can say more about what is causing this that isn't the natural part of the hydrological cycle, which is for snow to fall over Antarctica, and the continually forming icecap to slowly increase, move out to sea, and calve off icebergs.

You should consult your doctor. Usually, side effects are well tolerated. In some cases, your physician will direct you to use less RENOVA, decrease the frequency of application, increase the use of moisturizers, discontinue use temporarily or discontinue use altogether. RENOVA should only be used under medical supervision as part of a total skin care and sun protection program.

The overwhelming majority of abortions are performed in the first trimester of pregnancy. The Centers for Disease Control estimates that 58 percent of legal abortions occur within the first eight weeks of gestation, and 88 percent are performed within the first 12 weeks (based on the most recent data from 2000). Just over 10 percent are performed between 13 and 20 weeks. Less than one-half-of-one percent occur after 24 weeks.

CWD is relatively rare. In Colorado, for example, fewer than 200 cases, mostly in mule deer, have been documented since 1981. In checking hunter-harvested animals, less than 6% of deer and 1% of elk in north-central and northeastern Colorado were found to have CWD. Similar surveillance in southeastern Wyoming also indicated that less than 7% of deer had CWD. Deer and elk checked outside these areas in Colorado and Wyoming did not have CWD.

There are certain conditions in the urine including those caused by not drinking enough water, that make crystals which can tribute to stone formation. Some patients form stone because of anatomical malformations of the urinary tract, while other patient may have a genetic predisposition, environmental or nutritional risk factors.

Influenza pandemics are known to have occurred several times each century since the Middle Ages. There were three influenza pandemics in the 20th century, in 1918, 1957 and 1968. Experts believe we are overdue for the next influenza pandemic. No one can predict when a pandemic might occur, but many scientists from around the world are watching the H5N1 avian (bird) influenza situation in Asia and Europe very closely.

A "seizure" is a transient event caused by abnormal excitability of all or part of the brain. The principal cells of the brain, or "neurons", use several different types of chemicals (called neurotransmitters) to communicate with each other. These chemical messages are translated into electrical signals, which allow neurons in different parts of the brain to work together and perform tasks: to move your arm, read a book, or tell a story.

Herpes symptoms come and go, but the virus will remain in your body for life. Some people may never show symptoms, some may only show symptoms once or twice in their lives, and others may have symptoms many times each year.

During laparoscopic radical prostatectomy the entire prostate gland and seminal vesicles are removed. Once they are removed, the bladder is reattached to the urethra. If cancer has spread to the lymph nodes close to the prostate, these may also be removed by laparoscopy during surgery. This lymph node dissection is not necessary and thus is only performed on patients at high risk for metastasis (spread) of prostate cancer.

People are exposed to small amounts of radiation every day, both from naturally occurring sources (such as elements in the soil or cosmic rays from the sun), and man-made sources. Man-made sources include some electronic equipment (such as microwave ovens and television sets), medical sources (such as x-rays, certain diagnostic tests, and treatments), and from nuclear weapons testing.