4 letter words in science

i think that d. wind is the answer.   i missed the question when i answered a. currents.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is 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.