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

Based on their location in the atmosphere, the layers are able to have their own special characteristics. for example, most weather occurs in the troposphere. what occurs in each of the other layers?

Rah is completing a school project on the expansion of fast food restaurants across the united states. she finds a map that shows a clear pattern of restaurants beginning in the east and expanding west. this map was most likely created using the technology of

How are the arctic and antarctic circles alike?