Geo Final Unit

Question 1

What percent of Earth’s water is locked up in ice? What is the name for it?

Answer 1

2%. Cryosphere

Question 2

Sea level would rise ____ if melted.

Answer 2

250ft

Question 3

How many major episodes of ice ages are in the rock record?

Answer 3

12

Question 4

How long are ice age episodes?

Answer 4

10s of millions of years

Question 5

What is the current climate?

Answer 5

Interglacial period

Question 6

30% of Earth’s surface was covered how long ago?

Answer 6

18,000 yrs ago

Question 7

What percent of the surface is covered in ice now?

Answer 7

10%

Question 8

What is a glacier?

Answer 8

A moving body of ice formed by accumulation and compaction of snow?

Question 9

Glaciers have an internal….

Answer 9

Plastic flow

Question 10

Name two of the four snow conversions to ice:

Answer 10

Points of snowflakes sublimate
Some vapor fills in porosity
Pressure melting of flake points
Water refreezes; less porosity

Question 11

What is a firn?

Answer 11

Compacted snow after 1 season (spherical crystals)

Question 12

What are the three glacier classifications?

Answer 12

Cirque glaciers, valley glaciers, and Piedmont glaciers

Question 13

Function of ice caps?

Answer 13

In mountain highlands… Extensive and radiate outward

Question 14

Where is a good example of a budget of a glacier?

Answer 14

Glacier Bay, Alaska: 2006 - 2012

Question 15

What is the snow and Avalanche contributions called?

Answer 15

The zone of accumulation

Question 16

What is the snow and ice loss due to melting and sublimation called?

Answer 16

The zone of ablation

Question 17

Where is the snowline?

Answer 17

The line of equilibrium between zones.

Question 18

The terminus advances in the -

Answer 18

Positive budget

Question 19

The terminus retreats in the -

Answer 19

Negative budget

Question 20

Glacial drift is…

Answer 20

ANY sediment of glacial origin

Question 21

Glacial till is…

Answer 21

Ice melting and dropping its unsorted load

Question 22

What are ridges of till?

Answer 22

Moraines

Question 23

Name the three moraines:

Answer 23

Lateral moraines, medial moraines, and end moraines

Question 24

Another word for basin

Answer 24

Cirque

Question 25

Another word for lake

Answer 25

Tarn

Question 26

What is an Arête?

Answer 26

A knife-edged ridge

Question 27

What is a horn?

Answer 27

Erosion on three or more sides

Question 28

What are drowned glacial valleys called?

Answer 28

Fjords

Question 29

Know _______ _______ and the channeled scablands.

Answer 29

Missoula floods