Hurricanes are classified according to intensity using the

fujita scale

richter scale

saffir-simpson scale

doppler scale

Hurricanes are classified according to intensity using the Saffir-Simpson Scale.

Explanation:

A hurricane’s sustained wind speed is measured on Saffir-Simpson Scale. from 1 to 5. It can also predict the potential damage that the hurricane can cause with its strong wind spirals. As the levels signify categories as per the amount of destruction they cause, such a scale becomes of prime importance. Category level 3 hurricanes and above cause heavy loss of life and property, so detecting such catastrophes help in taking measures that can save lives and prevent future losses.

niger

explanation:

bc its the main river

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.