Using fossil fuels, farming, and construction are all examples of which of
these?
A. human activities that can cause pollution
B. practices that are pollution neutral
C. ways humans eliminate pollution
D. natural sources of pollution

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Which wave is the result of amplification and produces a louder sound

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?