Which sentence BEST states the central idea of the first paragraph of "Roller Coaster Physics"? A. Potential energy is created by the lift hill.

B. Gravity is the force that makes roller coasters possible.

C. Kinetic and potential energy work together to power roller coasters.

D. Potential energy builds as a train car goes up the lift hill, while gravity pulls a train car down the tracks.

If i could be any disney princess who would it be (guess by jus lookin at me)

Prior to researching, a writer should a. create an outline b. cite sources c. compose a draft d. create research questions select the best answer from the choices provided a b c d the answer is d

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.