By means of a hand pestle and mortar, or by a hand mill.
In the past food was ground using a hand pestle and morter,or by a hand mill
In the past food was ground using a hand pestle and morter,or by a hand mill
Farming allowed civilizations to establish settled communities by providing a consistent food source. This stability enabled population growth, division of labor, and the development of more complex societies. Additionally, surplus food production from farming allowed for trade, wealth accumulation, and the rise of cities.
For the same reasons modern civilizations had slaves. To do work and serve the masters
The past tense of grind is ground.
Only civilizations with a food surplus built them.
Food
Someone who studies past civilizations (archaeology) is an archaeologist.
The likely word is archaeologists (scientists studying past civilizations).
They work anywhere there are possible artifacts or past civilizations.
They needed to export wine, oil, and jewelry for food and raw materials.
It depends on the context. 'Ground' is already past tense. It is the past tense of 'grind'. On the other hand, you can be 'grounded' for staying out past your curfew.