Creation of the Great Lakes - Part 1

What percentage of the world's fresh water is held by the Great Lakes of North America?

• 10%

• 20%

• 30%

• 50%

Where is the Goderich Salt Mine located?

• Beneath Lake Superior

• Beneath Lake Ontario

• Beneath Lake Huron

• Beneath Lake Erie

How was the massive salt deposit beneath Lake Huron and Lake Michigan originally discovered?

• Through geological surveys

• By accident while drilling for oil

• During the construction of a new mine shaft

• By divers exploring the lakebed

What crucial evidence did Geologist John Zawisky discover on Thunder Bay island that provided clues to the rocky basin's origins?

• Ancient volcanic rock formations

• Fossilized remains of giant sea sponges

• Traces of a meteorite impact

• Unusual mineral deposits

What is the approximate age of the ancient rocks found beneath Lake Huron?

• 385 thousand years ago

• 3.85 million years ago

• 385 million years ago

• 3.85 billion years ago

Where was the landmass of America located approximately 385 million years ago?

• Near the North Pole

• In the Southern Hemisphere, south of the equator

• Along the equator in the Northern Hemisphere

• In its current position

How was dolostone formed from limestone in the ancient seas?

• Through volcanic activity and rapid cooling.

• By the evaporation of salty, briny sea water near the surface.

• Due to extreme pressure from tectonic plate collisions.

• From the accumulation of volcanic ash and sediment.

What is the primary chemical difference between limestone and dolostone, as demonstrated by the acid test?

• Limestone is calcium carbonate, while dolostone is calcium magnesium carbonate.

• Limestone is silicon dioxide, while dolostone is aluminum silicate.

• Limestone is iron oxide, while dolostone is potassium feldspar.

• Limestone is pure carbon, while dolostone contains sulfur.

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What geological process causes Niagara Falls to move upstream?

• Volcanic activity

• Tectonic plate movement

• Erosion of softer rock layers

• Sediment deposition