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Back to Mini-games  A changing river

Short-term changes

Flooding

Flooding in the Saguenay flood.

Heavy rains can cause lakes and rivers to flood very quickly. In the Saguenay region, in July 1996, six rivers flooded over only three days, breaking dams and changing the landscape considerably.

Photo: Musée du Fjord

Low tide, high tide

Photo montage of the Ha ! HA! bay at low and high tide.

Tides are controlled mainly by the pull of the Moon and Sun on bodies of water. Every day, there are two high tides and two low tides whose range various from day to day and also by location.

Photo: Musée du Fjord

Ice jams

Engraving of the ice jam in Montreal

In the spring, the ice covering rivers and streams breaks into pieces that drift off. This is called break-up. Sometimes, the ice gets stuck and prevents the water from flowing. We refer to this as an ice jam.

 

Photo: F. Méaulle, colorié par http ://www.antique-prints.de/

Long-term changes

Fossils

Ammonite fossil

Fossils result from the changes a living organism undergoes after dying and being buried in the ground. Fossilization is a long, slow process that can take thousands of years.

Photo: Caroline Julien

Formation of a fjord

Saguenay's fjord

The creation of a fjord like the Saguenay Fjord takes hundreds of millions of years. This valley was sculpted by ice flowing over it. The area then filled with seawater.  

Photo: Caroline Julien

Glacial erratic

Large rock in the middle of the land.

Sometimes, boulders are caught in a glacier and carried for many kilometers over hundreds of years. They are left when the glacier melts. This explains why we find them in unusual places, like the middle of a forest!

Photo: Caroline Julien
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