The younger layers of rock in the grand canyon are on top of the older layers. which of steno’s principles best explains this?

a) principle of original horizontality
b) principle of superposition
c) principle of lateral continuity
d) principle of original verticality

Air pollution is only caused by human activity, select the best answer from the choices provided ot of true or false

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent