The increase in trade and commerce during the middle ages resulted in the increase of the growth of towns and cities.
1. Rise in crime
2. Uncertainty within the people
Answer: dolomite rock that becomes soluble over time
Explanation: ageing infrastructure that combined with volatile climate that are major causes of the appearance of the sinkholes
Around 1800 (plus or minus about 5 years) is when it was estimated that the world's population had reached 1 billion.
