Ice jams: What causes them?
Johanna Wagstaffe answers your questions in Science Smart, a weekly video column
The freezing and melting of Canada's lakes and rivers are a beautiful but sometimes dangerous consequence of our four-season weather.
Johanna Wagstaffe explains how a potentially dangerous ice jam is made — and why it's important to know how they are made — all in this week's Science Smart video, in the player above.
If you have a science question you'd like answered, send Johanna a tweet (@Jwagstaffe) or an email: firstname.lastname@example.org.