quick quiz 1.give an example of an continental island 2.name one of the three parts of a ridge. 3.an...

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QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure in the ocean? 4.What is a flat topped Seamount called? 5.Long Island and England are what type of Islands?

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Page 1: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

QUICK QUIZ

1.Give an example of an Continental Island

2.Name one of the three parts of a Ridge.

3.An area of Subduction will form what type of structure in the ocean?

4.What is a flat topped Seamount called?

5.Long Island and England are what type of Islands?

Page 2: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 3: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Island Formation

• How do Islands form?

• Island Arcs- Philippines

• Hot spots---The Hawaiian Islands

• What does Darwin have to do with this?

• Atolls and Coral reefs

Page 4: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

1. Continental Islands = UK, New Zealand.2. Island arcs – Philippine & Aleutian Islands3. Volcanic Islands-

a. volcanic = Iceland, Hawaii, Azores, etc.

(1) along mid-ocean ridges, or(2) mid-basin “hot spots”.

b. coral - atolls(1) formed in warm, clear, tropical oceanic waters.(2) have volcanic bases.

Page 5: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Continental Islands

• Large chuck of land breaks off of a continental land mass.

• Ireland, England were originally part of the European continent (fig 2.14 p 31)

• New Zealand was part of Australia

Page 6: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Which Island can the Mid Atlantic Ridge be seen on land.

Irel

and

Icel

and

Fin

land

Gre

enla

nd

It c

annot b

e se

en o

n...

14%

71%

14%

0%0%

1. Ireland

2. Iceland

3. Finland

4. Greenland

5. It cannot be seen on land

Page 7: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

The three part of a ridge are the

Fla

nk, R

idge

and s

lope

Fla

nk, R

idge

Valle

y a.

.

Fla

nk, R

ift V

alle

y an

d...

Slo

pe, B

reak

and

Shel

f

0% 0%

100%

0%

1. Flank, Ridge and slope

2. Flank, Ridge Valley and Base

3. Flank, Rift Valley and Crest

4. Slope, Break and Shelf

Page 8: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

An example of Island Arcs created through subduction are

Icel

and

Haw

aiia

n Isla

nds

Man

hatta

n Is

land

The

Isla

nds o

f Jap

an

14%

29%

14%

43%1. Iceland

2. Hawaiian Islands

3. Manhattan Island

4. The Islands of Japan

Page 9: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

The most common geological structure in the ocean is

Abys

sal P

lain

s

Sea

mount

s

Guyo

ts

Abys

sal H

ills

25%

38%

13%

25%

1. Abyssal Plains

2. Seamounts

3. Guyots

4. Abyssal Hills

Page 10: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 11: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

B. Island Arcs1. arc-shaped chains of islands (Marianas,Aleutians)2. usually on continent side of trenches.3. made by active volcanoes - explosive type.4. marginal basins

a. between arcs and continentsb. serve to trap sediment and block itfrom the deep sea.

Aleutian Islands

Page 12: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Island Arc F

ormation

Page 13: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Hot Spots-Volcanic Islands

• A volcanic “plume” at a fixed spot in the mantle pushes through the crust creating a volcano.

• The volcano builds becoming a seamount which crests the ocean surface.

• The crust moves over the spot and the process is repeated.

• This is why you will get Island Chains such as the Hawaiian Islands

Page 14: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Hot Spot Formation

Page 15: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 16: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Page 17: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 18: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 19: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 20: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Volcanic Features

The Island Of

Hawaii

Page 21: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 22: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 23: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 24: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 25: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 26: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 27: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 28: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure
Page 29: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Coral Reefs

• Tropical waters only (temperature matters)• 20 – 30 degrees C• Form in shallow water next to island• As island erodes, reef remains• Can only live in Photic zone- If the Island (Atoll)

sinks below the photic zone the coral will die.• Photic Zone is the upper layer of water where

light can penetrate.

Page 30: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

•Largest reef –Great Barrier Reef covers 80,000 square miles

Page 31: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Charles Darwin

Page 32: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Darwin

• In his voyage around the world in the 1830’s Darwin formulated his theory on reef and atoll formation

• This theory is still considered valid and is used to this day

Page 33: QUICK QUIZ 1.Give an example of an Continental Island 2.Name one of the three parts of a Ridge. 3.An area of Subduction will form what type of structure

Life of a coral reef(as per Darwin)

Fringing reef

Barrier reef

Atoll