Which situation is a result of human activities? A. a decay of leaves in a forest adds to soil fertility
B. acid rain in an area kills fish in a lake
C. ecological succession following volcanic activity reestablishes an ecosystem
D. river systems branching off into natural tributaries

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.