How long does it usually take for a rock to be transformed from one rock type into another?

a.
a few days

b.
from 300 to 400 years

c.
about one thousand years

d.
thousands to millions of years

Does anyone know the answers for these

In the diagram below, ab and bc are tangent to o. what is the measure of

The great scientist alfred wegener proposed that continents have moved, while other scientists such as t.c.chamberlin argued against wegener. wegener's ideas eventually won, and are now widely accepted, because: a) wegener's ideas were more beautiful, and so were favored by the intellectual elite.b) wegener's ideas did a better job of predicting the results of new observations and experiments.c) wegener's ideas appealed to dead white european males, whereas chamberlin's didn't.d) wegener's ideas appalled dead white european males, and we all know that in this politically correct era,dead white european males cannot get a fair shake.e) wegener won the nobel prize.