Dams are important because:
They provide water for domestic, industry and irrigation purposes.
Dams often also provide hydroelectric power production and river navigation.
Domestic use includes everyday activities such as water for drinking, cooking, bathing, washing, and lawn and garden watering.
Dams and their reservoirs provide recreation areas for fishing and boating.
They help people by reducing or preventing floods. During times of excess water flow, dams store water in the reservoir; then they release water during times of low flow.
Characteristics of a rejuvenated river include water that flows rapidly with sloping sides that create steep cuts on the valley floor.
* there should be water
* there should be plants(life)
* there should be atmosphere
* there should be oxygen and carbon dioxide,ect,................
The correct answer is B. Placas tectónicas.
Explanation
Las placas tectónicas son los fragmentos de la corteza terrestre que están flotando sobre las capas de roca fundida (conocida como la astenosfera). En la tierra existen al menos 15 placas principales y más de treinta placas de tamaño mínimo. Las placas están en constante movimiento por las corrientes convectivas de la astenosfera no que le da origen a fenómenos como los volcanes, los sismos, la formación de cadenas montañosas y dorsales oceánicas. De acuerdo a lo anterior, la respuesta correcta es la B. Placas tectónicas.
