What do scientists call the huge slabs that form the earths crust

Which of the following expressions is equivalent to -1/4y - 2 1/4 + 1/2 (4-2y)? a. -3y + 2b. -3 1/2+4c. -4 1/2y+2d. -4 1/2y+2show ur work

Ineed quickly! which of the following would not be considered an example of the transition of europe into the formation of larger nation-states? a. the hundred years' war b. the unification of italy c. the marriage of isabella and fernando d. the height of feudalism

If a volcano’s magma is high in silica, the volcano will probably a. erupt quietly. b. remain dormant. c. erupt explosively. d. produce dark-colored lava.