Lisa Pearce, a 20 year old female from Gympie asks on November 6, 2007,In winter in very cold countries like Canada and Finland, most rivers, lakes and ponds freeze over. Cars can be driven over lakes and the ice does not break. But if you have a strong enough saw, you can cut through the ice and there will be water underneath. It is also common to fish through these holes and get good catches. Why don't rivers and lakes completely freeze when barrels of water do freeze solid? How do fish, crustaceans and plants survive these bitterly cold conditions?
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