The answer is probably A, i could be wrong tho
Answer:
Erosion
Explanation:
Over time it eroded into eachother causeing the plates to form upward.
Answer:
abacus
Explanation:
Focus On. There is a long history detailing the invention of computing and calculating machines. The earliest recorded calculating device is the abacus. Used as a simple computing device for performing arithmetic, the abacus most likely appeared first in Babylonia (now Iraq) over 5000 years ago.
The answer is: goods that are expensive and rare