Earthquakes generate compressional waves (p-waves) and shear waves (s-waves). Compared to the speed of shear waves in a given earth material, the speed of compressional waves is the fastest.
Because of this the compressional waves are the first waves to arrive on a complete record of ground shaking. They are also called P waves, which derives from this fact - P is an abbreviation for primary, first wave to arrive.<span>They typically travel at speeds between ~1 and ~14 km/sec.</span>
Conical Vent and Fissure Vents
Mid-Ocean Ridges
Composite Typer Volcanic Landforms
Shield Type Volcanic Landforms
Caldera
Answer:
Correct answer is A Greeks
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Explanation:
A is correct answer as Greece was the cradle of democracy, especially city-states Athens, from where the ideals of democracy spread to other countries. They had their political bodies, such an Assembly, where people could participate in the decision making.
All other options are wrong, as in this countries also these ideals spread from Ancient Greece.
Mountain chains and river systems generally run North-South throughout the continent thus making for formidable barriers to East-West expansion.
