3. the history of sir isaac newton’s study of gravity does which of the following? a. illustrates how a theory becomes a law b. provides an example of a theory that has been discredited c. demonstrates the importance of gravity in marine science d. shows that theories have long been an important part of science 4. all of the following are true of surface currents except a. they are influenced by wind. b. they can exist in large lakes. c. they are found in the top 1,300 feet of the ocean. d. they have the same movement as thermohaline currents.

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

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?

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water