Quiz 2

Question 0

Plastic materials in the ocean are?

Answer 0

1. Fragmented by wave action
2. Concentrate potentially toxic statements
3. Are broken down by sunlight
4. Transport non-native organisms to other localities

Question 1

Where are the highest concentrations of plastics in the ocean?

Answer 1

1. Extensive and persistent high pressure zones
2. Areas of slow currents
3. Areas of persistent high temperatures

Question 2

Seismic activity beneath mid ocean ridges…

Answer 2

1. May enhance the vigor/intensity of hydrothermal venting

2. May cause some vents to die off and start in new places

Question 3

The spacing of hydrothermal fields along ridge segments is influenced by?

Answer 3

1. Permeability distribution of the ocean crust
2. Location of the fissures and faults
3. Development of hydrothermal cells
4. Location of magma chambers beneath ridges

Question 4

Hydrothermal vent environments

Answer 4

1. May have played a fundamental role in the origin of life
2. Provide guides to searching for life on other planets
3. Are dynamic systems that rapidly change

Question 5

Diking events at mid-ocean ridges

Answer 5

1. Are characterized by hundreds to thousands of small earthquakes
2. Reflect extension events along the ridges
3. Are fundamental to formation of the oceanic crust

Question 6

The fluids issuing from high temperature vents

Answer 6

1. Rapidly entrain and vigorously mix with seawater
2. Contain high concentrations of dissolved metals
3. Rapidly precipitate out minerals such as pyrite (fools gold)
4. Turn back in color due to all the carbon they contain

Question 7

As seawater migrates to depth along mid-ocean ridges:

Answer 7

1. They reach temperatures in excess of 400 degrees C
2. They become enriched in magnetic gases
3. Oxygen is lost from the fluids
4. They extract heat, causing cooling of the surrounding rocks, which promotes cracking