volcano
Earthquakes
tsunami
hurricane
tornado
100
a seismic vibration, similar to a volcanic earthquake but longer duration and more continuous than earthquakes of the same amplitude. Volcanic tremor can last from minutes to days. It may be caused by magma moving through narrow cracks.
What is volcanic tremor, and how does it differ from earthquakes?
100
A tsunami is a series of waves with a long wavelength and period (time between crests) generated by a large, impulsive displacement of sea water.
What is a tsunami ?
100
The feeder bands are a term given to the showers and thunderstorms that follow the outer bands and precede the eyewall of a hurricane.
What are the feeder bands of a hurricane?
100
A tornado is a narrow, violently rotating column of air that extends from the base of a thunderstorm to the ground. Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. Tornadoes are the most violent of all atmospheric storms.
Is a tornado considered a storm?
200
Yes. A variety of earthquake types can occur at a volcano that is getting ready to erupt.
Do volcanoes produce different kinds of earthquakes?
200
Tsunamis are generated by any large, impulsive displacement of the sea level.
How are tsunamis generated ?
200
A Hurricane Warning means that a life threatening situation is imminent as a hurricane is less than 24 hours away from landfall.
What is a Hurricane Warning?
200
Tornadoes can last from several seconds to more than an hour. The longest-lived tornado in history is really unknown, because so many of the long-lived tornadoes reported from the early-mid 1900s and before are believed to be tornado series instead. Most tornadoes last less than 10 minutes.
How long does a tornado last?
300
There are about 169 volcanoes in the United States that scientists consider active.
How many active volcanoes are there in the United States?
300
Magnitude 2 and smaller earthquakes occur several hundred times a day world wide. Major earthquakes, greater than magnitude 7, happen more than once per month. “Great earthquakes”, magnitude 8 and higher, occur about once a year.
How often do earthquakes occur in the world?
300
On the average, two tsunamis occur per year throughout the world which inflict damage near the source
How often do tsunamis occur ?
300
The National Hurricane Center is part of the United States Department of Commerce. It's primary function is to provide advisories, warnings, and forecasts on tropical storms and hurricanes to residents along coastal areas of the United States.
what is the National Hurricane Center?
300
Tornadoes turn counterclockwise in the northern hemisphere. Warm air sweeps north, jet streams come in from the west, creating a situation in which the storms rotate counterclockwise. The tornadoes usually rotate that same way. Sometimes opposite direction swirls develop under a thunderstorm.
Which direction do tornadoes spin?
400
Residents can obtain copies of USGS volcano-hazard reports to determine whether they live or work in areas at risk from volcanic activity
How can residents who live near volcanoes prepare for future eruptions?
400
Earthquakes are naturally occurring phenomena. Most are caused by the constant movement between the Earth's plates
What Causes Earthquakes?
400
Tsunami (soo-NAH-mee) is a Japanese word meaning harbor wave.
What does the word "tsunami" mean ?
400
Yes, a tornado can occur in a hurricane because of the tremendous instability in the atmosphere caused by the friction between a landfalling hurricane, and the area its affecting, particularly in its Northeast quadrant where winds are the strongest, and the counterclockwise flow around it is prevalent. However, these tornadoes are usually minimal in strength, which is equivalent to F0 or F1 on the Fujita Scale
Can a tornado occur in a hurricane? Why or why not?
400
Although they are possible any time of the day or night, tornadoes tend to occur in the late afternoon and early evening hours, when the atmospheric conditions are most ripe for supercell thunderstorms. They are most common from 4pm to 9pm.
What time of day do most tornadoes occur?
500
Debris flows, or lahars, are slurries of muddy debris and water caused by mixing of solid debris with water, melted snow, or ice.
What kinds of hazards are associated with volcanic eruptions?
500
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)
How fast do tsunamis travel ?
500
Believe it or not, yes. Hurricanes are play a very important role in preserving the heat balance that the earth maintains by transferring heat from the tropics to the poles. They also can be very helpful to areas affected by drought with their torrential rains.
Are there any benefits to having a hurricane?
500
A: Some tornadoes may form during the early stages of rapidly developing thunderstorms. They spin up when an storm's updraft picks up a low-level spinning vortex and tilts up upward. It then stretches it making it spin faster. These types of tornadoes are most common along the front range of the Rocky Mountains, in the Plains and the Western states. They are called "landspouts" because they look and form much like waterspouts. See the next question for more about waterspouts.
Are there different kinds of tornadoes?
M
e
n
u