Viscosity is the ability of a substance (in this case, lava) to resist flow. First of all, the temperature of the lava affects the viscosity. Lava with a higher temperature has lower viscosity than cooler lava (higher viscosity) since cooler lava is starting to solidify thereby increases its resistance to flow. The composition of the lava is also a determinant of viscosity such as the silicon content of the lava. The higher the silicon content of the lava, the higher the internal friction of the lava, thereby higher resistance to flow.
The correct answer is B. False
Explanation:
Russia is considered the largest country in the world, located in both Asia and Europe. In terms of population, most of the Russian population is now located in the western zone of the country or in Europe, which includes cities such as Moscow or St. Petersburg. Despite this, since the 19th century and especially during the Soviet Union period there were migrations of Russians eastward or towards the Pacific coastal zone, which led to the creation of Russian settlements in new zones.
However, in the last decades, this migration pattern has decreased and settlements in the east are still small in comparison to those of the west. In this context, the eastward migration has not been a huge phenomenon since 1991, and even if there is still migration and the government promotes this, it has not led to a lack of accommodations or restrictions, which makes the statement false.
noun
1.
a fertile spot in a desert, where water is found.
or
2.
type of rigid foam into which the stems of flowers can be secured in flower arranging.
Answer:
The correct answer is d) atmospheric air pressure
.
Explanation:
The atmospheric pressure, also known as barometric, is what causes the weight of the mass of air that is acting on the earth.
This value will be higher or lower, depending on the altitude at which we are, with reference to the lowest point considered, which is usually the sea level, but is also influenced by some atmospheric effects produced by the circulation of currents of warm or cold air.
Theoretically, it is considered that the maximum value of atmospheric pressure is achieved at sea level, although in some parts of the earth there are areas below that level. Its value at this point corresponds to 1013 mbar or 760 mm Hg. The value of 1 atmosphere (atm) is also commonly used as a reference unit, but is not included in the International System of Units.
It is also known as barometric pressure, due to the instrument used for its measurement. It was Evangelista Torricelli who in 1643 invented the first barometer, although the name was given by Edme Mariotte some years later.
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