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Geography > Minnesota > Flashcards

Minnesota Flashcards

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1
Q

Which case study is Minnesota for?

A

Landscape associated with the action of ice sheets.

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2
Q

The landscape results from glacial activity throughout which geological time period?

A

Quaternary period

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3
Q

When did this start and finish?

A

2 million years ago to the present.

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4
Q

What was the name of the main ice sheet that covered much of North America?

A

Laurentide ice sheet

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5
Q

How thick was the Laurentide ice sheet?

A

1km thick

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6
Q

Across Minnesota there are belts of which types of rock?

A

Sedimentary (softer)

Volcanic (harder)

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7
Q

What rock type have many of volcanic rocks metamorphosed into?

A

Greenstone

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8
Q

When did tongues of ice (lodes) extend from the Laurentide ice sheet across Minnesota today?

A

75,000years ago

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9
Q

Name examples of lakes that have fromed in the erosional ellipoid basin that the ice sheet carved

A

Upper and lower Red lakes

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10
Q

Where was he elliptod basin eroded deeply due to there being weaker rocks?

A

Arrowhead

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11
Q

What are the weaker rocks called?

A

Shale

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12
Q

Name two ice lobes that advanced across Minnesota 75,000 years ago

A

Wedena lobe and Des Moines lobe

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13
Q

What type of till did the Wadena lode deposit?

A

Red and sandy

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14
Q

Name depositional landforms left by the Wadena Lobe

A

Itasca moraine

Drumlin fields at Otter tail and Wadena county

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15
Q

The Des Moines lobe left behind a different type of till. Describe it.

A

Tan
Clay
Rich
Calcareous

Because the ice sheet had eroded limestone further north

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16
Q

How deep are some of the till deposits left behind?

A

Over 100m

17
Q

Name a proglacial lake created next to the Laurentid ice sheet.

A

Lake Agassiz

18
Q

What area did this lake cover?

A

440,000squ km

19
Q

Where did the lake overflow the recessional moraine damming it in?

A

Browns valley

20
Q

What was the river called that made its way fom the lake to the sea when the moraine was breached?

A

Glacial River Warren

21
Q

How high are the highest peas in Minnesota today?

A

500- 700m above sea level. (They have been greatly eroded by the ice sheet)

Geography (6 decks)

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