Total energy input= useful energy +?

the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.

can you make it bigger i can't see it

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.