Answer:
They have very weird climates.
Explanation:
Southern Ontario and Quebec have a climate with hot, humid summers and cold, snowy winters, similar to that of some portions of the American Midwest. Except for the west coast, all of Canada has a winter season with average temperatures below freezing and with continuous snow cover.
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Karst Topography is a chemical reaction about the dissolution of layer(s) of soluble bedrock, clearly, carbonate rock like limestone or dolomite. Acidic water erodes the calcium in the bedrock, which is a main constituent of carbonate rocks in creating caverns. First tiny fractures/tunnels form in the rock and yet, with adequate time and dissolution, this acidic erosion can make huge caverns.