The sentence "Moreover, it is probably just as valuable or more valuable to us now, than it was in the ancient past".
Answer:
The rock cycle is a concept used to explain how the three basic rock types are related and how Earth processes, over geologic time, change a rock from one type into another. Plate tectonic activity, along with weathering and erosional processes, are responsible for the continued recycling of rocks.
HOPE THIS HELPS!
First map
1 cm------ 10 km
40 cm---- x
x= (40 * 10) /1
x= 400 km, Cincinnati is 400 km away from Cleveland.
Second map
1 cm------ 50 km
x---------- 400 km
x= (400 * 1) /50
x= 8, Cincinnati is 8 cm away from Cleveland.
