Tina creates the layered column of liquids shown below to demonstrate certain characteristics of the layers of the Earth Oil (density 0.s5 omL) Water (dernsity 1.00 pim -Corn syrup (densily 1.02 gml Density Column Which of the following is the biggest limitation of how this model can represent Earth? O Convection is not possible in this model OWaves, such as seismic waves from an earthquake, are not able to travel through this model O Density is not an important characteristic of Earth's layers O Relative thickness of the layers is not accurate

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?