Josyvan , 7/10/2007
Question: How hurricanes are named?
The National Hurricane Center began officially naming tropical storms and hurricanes in 1950, although some forecasters had been informally naming storms since the 19th century. The WorldJosyvan , 7/10/2007
Satellite MeteorologyEarth-observing satellites can provide images of large weather systems, such as Hurricane Gloria, shown here. These pictures reveal patterns and movement that provide cluesJosyvan , 7/10/2007
Question: How Hurricanes form?
Hurricane Opal DestructionResidents of Fort Walton Beach, Florida, inspect damage caused by Hurricane Opal. Hurricane Opal was the second hurricane in the 1995 season to strike Pensacola,Josyvan , 7/10/2007
Question: How to identify birds?
West African Weaver NestThe weaverbird relies on instinct as well as its nimble feet and beak to build its nest of knotted grass. The entrance tunnel frustrates predatory snakes trying to getJosyvan , 7/10/2007
Question: How to identify birds?
Characteristic behaviors can be an important part of bird identification. Birds have different ways of nesting, courting, foraging for food, swimming, walking, and flying. For example, someJosyvan , 7/10/2007
Question: How to identify birds?
Bird vocalizations provide strong clues to a bird’s identity, although identifying distinctive songs and calls in the wild requires patience, experience, an excellent memory, and a finelyJosyvan , 7/10/2007
Question: How to identify birds?
Bird identification often begins with what birders call jizz (the general impression of size and shape that a bird conveys at first sight). Jizz is not a definitive identification technique,Josyvan , 7/10/2007
Question: How to identify birds?
Identifying birds is one of the most challenging tasks that birders face. Identification can be challenging because the traits that distinguish one species from another are often subtle andJosyvan , 7/10/2007
Question: How metabolism drives its energy?
In keeping with the first two laws of thermodynamics, organisms can neither create nor destroy energy but can only transform it from one form to another. Thus, the chlorophyll of plants, at theJosyvan , 7/10/2007
Question: How rockets work?
Soyuz RocketThis Russian Soyuz rocket carried cosmonauts to the Mir space station in 1992. The boosters attached to the outside of the first (bottom) stage of the rocket are clearly visible inJosyvan , 7/10/2007
Question: How rockets work?
Thrust is a measurement of the force of a rocket, or the amount of “push” exerted backward to move a rocket forward. Thrusts vary greatly from rocket to rocket. Engineers measureJosyvan , 7/10/2007
Question: How rockets work?
The motion of a rocket is much like the motion of a balloon losing air. When the balloon is sealed, the air inside pushes on the entire interior surface of the balloon with equal force. IfJosyvan , 7/10/2007
Question: How rockets work?
All rockets—whether small or large, simple or complex—work by the basic principle of action and reaction, which was formulated by English scientist Sir Isaac Newton in 1687.Josyvan , 7/10/2007
Question: How astronauts work?
The very first astronauts were little more than human test subjects, but today’s astronauts are pilots, scientists, and engineers with active roles in many aspects of their missions. InJosyvan , 7/9/2007
Question: How stars produce energy?
Fusion: The Energy of the SunDiscovery Enterprises, LLCFor many years astronomers were puzzled about how the Sun provided energy. While Earth’s fossil record indicates that the Sun hasJosyvan , 7/9/2007
Question: How Light Travels?
Diffraction and Interference of LightWhen light passes through a slit with a size that is close to the light’s wavelength, the light will diffract, or spread out in waves. When lightJosyvan , 7/9/2007
Question: How about Eclipse?
Total Solar EclipseDuring a solar eclipse, the moon moves between the sun and the earth. The light from the outer part of the sun’s atmosphere, called the corona, became visible during aJosyvan , 7/9/2007
Question: How about Eclipse?
If the earth’s orbit, or the ecliptic, were in the same plane as the moon’s orbit, two total eclipses would occur during each lunar month, a lunar eclipse at the time of each fullJosyvan , 7/9/2007
Question: How about Eclipse?
The length of the moon’s umbra varies from 367,000 to 379,800 km (228,000 to 236,000 mi), and the distance between the earth and the moon varies from 357,300 to 407,100 km (222,000 to 253Josyvan , 7/9/2007
Question: How about Eclipse?
EclipseThe earth, lit by the sun, casts a long, conical shadow in space. At any point within that cone the light of the sun is wholly obscured. Surrounding the shadow cone, also called the