What is the main purpose of sustainable agriculture? a. to feed a growing world without damaging the ecosystem b. to produce cheap and abundant food at a high cost c. to increase farming efficiency and profits d. to rely heavily on mechanization, pesticides, and fertilizers

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

When ash and dust begin to settle on the ground, they eventually become compacted by

Communication and transportation have improved as a result of scientific advancements. select the best answer from the choices provided of mark this and return save and exit next