Which model of the atom first introduced the idea of a nucleus?

a. thomson's model.
b. bohr's model.
c. rutherford's model.
d. dalton's model.

How many moles of al3+ ions are in 1.25 moles of al2o3

In 2002, the rare earth elements mine in mountain pass, california was closed because

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic