Answer:
External and Internal forces.
Explanation:
The earth's relief forms such as Mountains, Rivers, Plateaus etc, are changed because of the action of internal and external forces for example; wind, water or human activities.
Ejemplos de fuerzas
En la naturaleza, las fuerzas fundamentales son la gravedad, la fuerza nuclear débil, la fuerza nuclear fuerte, la fuerza electromagnética y la fuerza residual. La fuerza fuerte es lo que mantiene unidos protones y neutrones en el núcleo atómico.
The most abundant fossil fuel is coal... Coal isn't only our most abundant fossil fuel,it's also the one with perhaps the longest history. The U.S. has more coal reserves than any other country in the world. In fact, one-fourth of the all the known coal in the world is in the U.S.
Its a cinder cone cause after it all falls down to make deposits.
