Choose all the answers that apply.

the thermosphere:
increases in temperature as altitude increases
contains the ozone layer
is divided into the ionosphere and exosphere
is where auroras happen
is used for orbiting satellites

which of the following statements is true?
the earth's core is made of liquid metal.
convection currents in the mantle cause the movement of crustal plates.
the earth's crust is very hard and strong. it is difficult for magma to break through.
the presence of sedimentary rocks means the area was once near an active volcano.

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?