I’m pretty sure it’s the 2nd one :)
Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns develop underground.
Sinkholes are formed when the land surface above collapses or sinks into the cavities or when surface material is carried downward into the voids. Drought, along with resulting high groundwater withdrawals, can make conditions favorable for sinkholes to form.
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Canada is divided into four subregions—the Atlantic, Core, and Prairie Provinces, and the Pacific Province and the Territories. Each subregion possesses unique natural resources, landforms, economic activities, and cultural life. of Canada's population is in urban areas within 100 miles of the U.S.-Canadian border.
In 1867, three colonies of British North America — Canada, Nova Scotia and New Brunswick — were united in Confederation, with the former Province of Canada being divided into Ontario and Québec.
Quebec and Ontario are often referred to as Canada's heartland, and with good reason. Three out of five Canadians live there. Ontario is the largest province in terms of population, Quebec in land area. Most of the settlement in these inland provinces is found along the Great Lakes and the St.
