Which activity demonstrates chemical weathering? A= dissolving of limestone by acid rain
B= grinding of talc into a powder
C=freezing of water in the cracks of a sandstone sidewalk
D= abrasion of a stream bed by tumbling rocks

Can someone me with questions 12 and 13 plz.

Which states of matter have particles that move independently of one another with very little attraction?

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.