How is chemical weathering different from physical weathering?(1 point) Chemical weathering requires a reaction with water, while physical weathering does not. Chemical weathering requires a reaction with water, while physical weathering does not. Chemical weathering forms new substances, while physical weathering does not. Chemical weathering forms new substances, while physical weathering does not. Chemical weathering involves plants and animals, while physical weathering does not. Chemical weathering involves plants and animals, while physical weathering does not. Chemical weathering results in the breakdown of rock, while physical weathering does not.

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

Rohit is trying to tune an instrument

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.