Answer:
volcano is a type of earthquare
Esuit missionaries visiting the region in 1654 were the first to report salty brine springs around the southern end of "Salt Lake," known today as Onondaga Lake.
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(This is from Wikipedia)
Answer:
Explanation:
A second cholera pandemic reached Russia (see Cholera Riots), Hungary (about 100,000 deaths) and Germany in 1831; it killed 130,000 people in Egypt that year.[12] In 1832 it reached London and the United Kingdom (where more than 55,000 people died)[13] and Paris. In London, the disease claimed 6,536 victims and came to be known as "King Cholera"; in Paris, 20,000 died (of a population of 650,000), and total deaths in France amounted to 100,000.[14] In 1833, a cholera epidemic killed many Pomo people which were a Native American tribe. The epidemic reached Quebec, Ontario, Nova Scotia[15] and New York in the same year, and the Pacific coast of North America by 1834. In the center of the country[clarification needed], it spread through the cities linked by the rivers and steamboat traffic.
Answer:
Option (2)
Explanation:
The earth's interior is divided into 3 parts which includes the crust, core and the mantle. The core of the earth represents the extreme interior part of the earth which is covered by the mantle. The density of the core is the highest and is approximately 13 g/cm³, Whereas, the density of the mantle (including both the upper and lower mantle) is relatively less and is about 4.5 g/cm³ on an average.
The asthenosphere is the layer in which the rocks are solid but they tends to flow during deformation. This layer is present in the apex portion of the upper mantle and it has a density of nearly 3.3g/cm³.
The continental and the oceanic crust represents the outermost portion of the earth. The rocks of oceanic crust are denser than the rocks of continental crust. The density of the oceanic crust is nearly 3 g/cm³ and continental crust is 2.7g/cm³.
Thus, the continental crust is the less dense, compared to the other layers of the earth.
Hence, the correct answer is option (2).
