Choose all the answers that apply. Which of the following increases erosion?

careless farming
crop rotation
leaving fields unplanted
clearing forests
contour plowing

What is the independent variable in this investigation? mass volume sample number substance density

Light waves travel than sound waves.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt