Trey was asked to build a working model of a landform for a science project. He chose to build a model of a volcano.

Trey formed a base out of clay and then painted the model so it resembled a cinder cone volcano.
Finally, Trey mixed baking soda, vinegar, and red food coloring in the base, so it mimicked lava flowing out of the volcano. Once he was finished with his project, Trey's teacher asked how useful his model was.

What factor best determines the usefulness of the model?
A.
how closely the model's size matches the real world
B.
how closely the model's composition matches the real world
C.
how closely the model's color matches the real world
D.
how closely the model's behavior matches the real world

the civil war started because of uncompromising differences between the free and slave states over the power of the national government to prohibit slavery in the territories that had not yet become states. when abraham lincoln won election in 1860 as the first republican president on a platform pledging to keep slavery out of the territories, seven slave states in the deep south seceded and formed a new nation, the confederate states of america. the incoming lincoln administration and most of the northern people refused to recognize the legitimacy of secession. they feared that it would discredit democracy and create a fatal precedent that would eventually fragment the no-longer united states into several small, squabbling countries.

i believe it caused a regional impact in societ