Answer:
internal migration: moving within a state, country, or continent.
external migration: moving to a different state, country, or continent.
Explanation:
I think that the answer is c, ridges!
Various phenomena, such as rainfall, snowmelt, monsoons, typhoons, hurricanes, and cyclones can cause rivers to<u> </u><u>flood</u> their banks.
Flooding typically takes place while prolonged rain falls over numerous days, heavy rain falls over a brief length, or whilst an ice or debris jam causes a river or circulates to overflow onto the surrounding place. Flooding can also result from the failure of water manipulate structures, including a levee or dam.
The most essential sources of flood-inflicting precipitation and runoff within America are extratropical cyclones and their associated fronts; convective thunderstorms, especially after they arise in mesoscale convective structures; and tropical cyclones.
Learn more about floods here: brainly.com/question/20292873
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Sound wave is a pressure caused by the vibration of something in a medium that transfers anergy, like air.
The correct answer is - Tethys Ocean.
The Tethys Ocean was an ocean that was situated between the European and African continents, through what is now the Middle East and parts of Central Asia, and the northern half of the Indian Ocean. Because of the geologic activities, mainly the movement of the Indian plate towards Asia, and the Alpine orogenesis, the ocean was becoming smaller and smaller, and it started to be divided into smaller pieces, until it totally disappeared. One of the remains of this ocean is the largest lake in the world, the Caspian Lake, often referred to as Caspian Sea, and it can easily be seen that this body of water was once part of a much bigger body of water with saline water, because it itself has saline waters.
