Ir=Initial Intensity/Area of spread=Io4πr2
Ir∝1r2
It is seen from this expression that intensity is inversely proportional to the square of the distance. As we move away from the light source the intensity decreases at the rate of square of the distance from the source.
Brightness being the perception of intensity. more the intensity more bright the object is perceived and vice versa.
Mantle I think idrk cuz of erosion
Answer:
The speed maximum speed is 
Explanation:
The centrifugal force always acts on the cylinder and move away the rotating platform from the rotational axis. so the centripetal force provide by the frictional force:
Therefore
coefficient of static friction: 
mass of the cylinder:
\
distance of the cylinder from the turntable: 

cross multiply to find v

Agility is the answer. Hope this helps have an awesome day!
Scientists are able to learn about Earth's interior structure by measuring the arrival of seismic waves at stations around the world.
B. Study the interior of earth