Which of these features was formed by river erosion? group of answer choices
the grand canyon
the big island of hawaii
the appalachian mountains
the himalaya mountain range

A) The Grand Canyon

Explanation:

The Grand Canyon is the only option here that was formed from erosion. Hope this helps :)

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.