Ice melting:
Melting polar ice is a global problem that has accelerated since the 20th century due to human activity. This change affects not only sea level but also the Earth’s climate. Changing conditions cause the ice sheets and glaciers to melt, releasing heat energy into the atmosphere. These energy transfers are the primary driver of greenhouse warming.
As a result, the amount of ice in the world’s oceans has fallen by more than four trillion tons over the last three decades. Those losses are expected to continue to accelerate.
The loss of ice is devastating to wildlife, including polar bears, walruses, snowy owls, and reindeer. As they lose habitat, animals must move farther from their food sources and may encounter humans in unfamiliar places. This movement brings wildlife and people into closer contact, increasing conflict.
Choosing the Right Ice Melt
The type of ice melt you use is important to ensure that surfaces are safe and clear of ice, snow, and debris. While traditional salt-based products like sodium chloride and calcium chloride are effective, they can damage concrete and vegetation when applied incorrectly. Newer products are less damaging and more environmentally friendly, such as magnesium chloride flakes or urea-based ice melts.
Have students predict what will happen to an ice cube placed in different solutions. They can test the effect of air temperature, room temperature water versus cold water, and placing the ice cube in a container that is warmer than another. They will also need to record the results of their experiment, such as how long it takes for the ice cube to melt in each condition.
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