The Freezing Dunes of Northern Canada

The Athabasca Dunes, located in northern Canada, are one of the world's most unique habitats. Formed around 10,000 years ago after the last glacial period, these dunes are shaped by historical glaciation and wind patterns. Despite their desert-like appearance, the dunes support a diverse ecosystem with ten endemic plant species adapted to the harsh conditions. Conservation efforts are in place to protect this rare environment, which is largely within Saskatchewan's Athabasca Sand Dunes Provincial Park.

What is the primary reason the Athabasca Dunes are not considered a desert?

• They are covered by ice sheets year-round.

• They have sufficient precipitation to sustain a large lake.

• They are located at a high latitude.

• They are protected by a provincial park.

How did the Athabasca Dunes form at the end of the last glacial period?

• By tectonic movements creating sand deposits.

• Through the retreat of ice sheets leaving behind till.

• Through the erosion of nearby mountains.

• By volcanic activity depositing ash.

What role did winds play in the development of the Athabasca Dunes?

• They prevented plant growth, allowing sand to accumulate.

• They blew sand away, preventing dune formation.

• They helped stabilize the sand with plant growth.

• They caused the dunes to erode over time.

Which feature helps the large-headed woolly Yarrow retain moisture?

• Its deep root system.

• Its lightweight seeds.

• Its ability to grow quickly.

• The hairs covering its stem.

What is a significant threat to the Athabasca Dunes despite their protection?

• Invasive species.

• Increased tourism.

• Urban development.

• Climate change.