At a location, rainwater runs off the face of a cliff that is 15 meters high. how is the face of the cliff likely to change over time? weathering by water would cut its middle deeper than the top. weathering by water would cut its top deeper than the middle. the top would slope gently due to deposition of sediments. colored mineral streaks would be formed due to erosion.

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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.

Which planets are visible without a telescope