How do elements become stable? Many atoms become stable when their valence shell is filled with electrons or when they satisfy the octet rule (by having eight valence electrons). An atom stabilizes by bonding with another atom in order to fill out its outer set of electrons in its shell. How are elements held together? […]

What are the 3 names of St Petersburg? In the more than 300 years since it was established, St. Petersburg has also been known as Petrograd and Leningrad, though it’s also known as Sankt-Peterburg (in Russian), Petersburg, and just plain Peter. What was St Petersburg Russia previously called? Leningrad Why did Leningrad change its name? […]

How does the position of the sun change from summer to winter? On the summer solstice, the Earth’s north pole is tipped toward the Sun. In the northern hemisphere, this means the Sun gets high in the sky at noon. But in the winter, when the Earth is on the other side of its orbit, […]

What is the term for all living organisms in an ecosystem? An ecosystem can be described simply as the collection of all living and non-living components in a particular area. The living components of the environment are known as biotic factors. Biotic factors include plants, animals, and micro-organisms. Ecosystems vary in diversity. What is the […]

Why are HCFCs not as harmful to the atmosphere as CFCs? Because they contain hydrogen, HCFCs break down more easily in the atmosphere than do CFCs. Therefore, HCFCs have less ozone depletion potential, in addition to less global-warming potential. HFCs do not contain chlorine and do not contribute to destruction of stratospheric ozone. What makes […]

Is the jet stream a Rossby wave? The northern jet stream is a river of fast-moving air that circles the northern hemisphere in the mid-latitudes. Jet-stream winds generally travel at the same latitude, but they can shift into a wave-like pattern, known as Rossby waves, where they meander from north to south and back again. […]

What US state capital has three words in its name? Salt Lake City Which state’s capital has the longest name? Can you name the longest named state capitals? # of Letters Capital City % Correct 12 Oklahoma City 61.1% 13 Jefferson City 59.7% 12 Salt Lake City 54.4% 12 Indianapolis 54% Which US state has […]

How did they construct the Eiffel Tower? On the Seine side of the construction, the builders used watertight metal caissons and injected compressed air, so that they were able to work below the level of the water. The tower was assembled using wooden scaffolding and small steam cranes mounted onto the tower itself. How much […]

What do population geographers study? Population geography is a branch of human geography that is focused on the scientific study of people, their spatial distributions and density. What is population change in geography? Population change, defined generally, is the difference in the size of a population between the end and the beginning of a given […]

Why are P waves received but S waves are not received by seismic stations? Answer: P and S waves are types of seismic waves . The reason whey P waves are received but S-waves are not received by seismic stations located on the opposite side of Earth from an earthquake epicenter is because those waves(S-waves) […]