Let them through the more the merrier.
Answer:
Hydraulic mining developed from ancient Roman techniques that used water to excavate soft underground deposits. Its modern form, using pressurized water jets produced by a nozzle called a "monitor", came about in the 1850s during the California Gold Rush in the United States.
Explanation:
Thank you for posting your question here at brainly. I think the answer is the second one which is "Natural geographic barriers prevented major cultural development in these civilizations." I hope the answer will help.
The dogs during the pre 1800’s were not mainly seen as a
companion or a friend in which the society today claims. During this period,
the dogs are mostly seen as an animal who serves as hunting, herding and
protection to people.