Science

Refine Search

What is a drowned river valley called?

Estuaries developed from seawater that flooded river mouths and lowlands. A common example of a drowned river valley is the Chesapeake Bay. Estuaries are areas that are semi-enclosed where sea water and fresh water mix and meet up. This happens when rivers flow into the ocean. Other examples of drowned river valleys include the Thames River in England and the Murray River in Australia.

Continue Reading

When does Eastern standard time change for Daylight Saving Time?

As of 2007, the United States observes Daylight Savings from the second Sunday in March until the first Sunday in November. In both cases, the change over from Standard time to Daylight Savings time is made at two in the morning.\nAlthough this change is made nationwide, it is not observed uniformly. All areas that do observe Daylight Savings do so at the same time; however, parts of a few states ignore Daylight Savings and remain on Standard time throughout the year.

Continue Reading

What gases are found only in the troposphere?

The troposphere contains 99 percent of atmospheric water vapor. Water vapor concentration varies in different climates, ranging from trace amounts around the poles to over 4 percent in tropical regions. Tropospheric water vapor is the key participant in the Earth’s water cycle. Water evaporating from oceans, seas and lakes condenses in the troposphere, is carried by winds, then falls to the Earth again as precipitation. Without this process, life on Earth would cease to exist, as fresh-water resources would no longer be replenished.\nThe troposphere also contains carbon dioxide in trace amou..

Continue Reading

Which animal has the longest tail?

The female giraffe's tail might not reach the same length as that of the male. Both male and female giraffes have blunt horns that are covered by skin. The Giraffa camelopardalis also has an impressively long neck.Another species that has an impressively long tail is the long-tailed pangolin. They are native to parts of Africa. These animals have prehensile tails that are more than half of their total length. The male of the species also has a longer tail than that of the female.

Continue Reading

How does the air pressure affect the human body?

ACS Distance Education explains that air pressure is the force exerted by the weight of air molecules. Atmospheric pressure is determined by the amount of air directly above a person or object. At sea level, the atmospheric pressure is 14.7 pounds per square inch, or PSI. At higher altitudes, the PSI decreases due to lower air pressure and density. Skin adjusts easily to changes in pressure, but the cavities within the body, such as the lungs, ears and sinuses, do not adjust automatically. This is why many people experience a popping in their ears while taking off in an airplane or driving thr..

Continue Reading

What are two functions of the cell membrane?

The cell membrane is the thin layer on the outer boundary of a cell or internal cell compartment, as defined by the Encyclopedia Britannica. Membranes are composed mainly of a lipid bilayer. These lipids give the membrane a fluid consistency comparable to a light oil. The fatty chains inside the membrane allow small, fat-soluble molecules to enter the cell while repelling large, water-soluble molecules. This allows molecules like oxygen to enter the cell while barring harmful molecules like sugar and calcium. Also, membrane channels allow ions to pass freely in and out of the cell. This enable..

Continue Reading

How do you get real-time California earthquake updates?

The California Real Time Earthquake Update site posts data every five minutes and displays the information for 24 hours. For each earthquake, it provides the time it occurred, the magnitude, the depth and the location in coordinates.\nThe Global Incident Map displays the time, magnitude, depth and name of region for earthquakes in California and elsewhere. Visitors can zoom in on California on the map to see only earthquakes that happened in that state.

Continue Reading

What are effects of ether on humans?

Ether contains no distinct color, but produces a strong odor. It features a high level of flammability and reacts readily with many substances. Its high level of reactivity makes proper handling and storage crucial. This substance warrants controlled and supervised use in laboratories, as it ranks among the most flammable and volatile chemical substances. Although potentially hazardous in laboratory settings, the highly explosive nature of ether makes it ideal for creating explosive substances like fireworks. Ether reacts with water and oxygen, and requires storage in tightly sealed containers..

Continue Reading

How many liters are in a gallon?

In both the U.S. and British Imperial systems of measurement, a gallon is equal to 4 quarts or 8 pints. However, in the U.S. system, a gallon is 128 fluid ounces, while an imperial gallon is 160 fluid ounces.\nThe word "gallon" is thought to derive from the medieval Latin word "galeta," meaning a pail or a liquid measure. Its first appearance in the English language dates back to the 13th century.

Continue Reading

What is diamond dust used for?

Diamonds have a chemical structure that makes them harder than nearly every other natural or synthetic substance. Diamonds are an important natural resource and because of their unique properties are valued for both gem making and industrial purposes. The percentage of diamonds used to create gems for jewelry averages at below 20 percent. Even in uncut form, these high-grade diamonds have a high refractive index and exhibit strong dispersion.Lower-grade diamonds are used in many industrial settings, such as mining. Diamond encrusted rotary bits are used to drill oil wells and for tunneling thr..

Continue Reading
Showing 8981 to 8990 of 10000 (1000 Pages)