Answer:
The average flow velocity of a river increases along its long profile. This makes sense; along the profile, more potential energy is converted to kinetic energy, increasing the velocity. This is only the average velocity however; a cross-section of a river shows that the velocity varies from one side to the other.
Explanation:
Slowly because air has a hard time to reach the magma because it is below the surface of the erth
Copper silver and gold that found in barazil
