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Homework answers / question archive / Question 1 1 / 1 pts Oceanic crust is primarily made of    Granite     Basalt     Aluminum compounds     Potassium and uranium     Question 2 1 / 1 pts Density is defined as:                        The speed that liquid moves over time     The weight of a substance     The mass per unit of volume or the relative heaviness of a substance     The specific depth of Earth's layers   Information can be found in the section 3

Question 1 1 / 1 pts Oceanic crust is primarily made of    Granite     Basalt     Aluminum compounds     Potassium and uranium     Question 2 1 / 1 pts Density is defined as:                        The speed that liquid moves over time     The weight of a substance     The mass per unit of volume or the relative heaviness of a substance     The specific depth of Earth's layers   Information can be found in the section 3

Biology

Question 1

1 / 1 pts

Oceanic crust is primarily made of

  

Granite

   

Basalt

   

Aluminum compounds

   

Potassium and uranium

 

 

Question 2

1 / 1 pts

Density is defined as:                  

 

  

The speed that liquid moves over time

   

The weight of a substance

   

The mass per unit of volume or the relative heaviness of a substance

   

The specific depth of Earth's layers

 

Information can be found in the section 3.2,  Earth’s Interior Is Layered.

 

Question 3

1 / 1 pts

What is responsible for the formation of the Hawaiian Islands?

  

Two oceanic plates are converging at that location

   

Two oceanic plates are diverging at that location

   

Oceanic currents depositing large amounts of sediment

   

An oceanic plate moving over a stationary mantle plume and hot spot

 

 

Question 4

1 / 1 pts

What is isostatic equilibrium?

  

Bands of magnetic reversal on the sea floor

   

An important chemical found in Earth's mantle

  

The mechanism that explains how continents drift

   

The geologic state when all the continents are joined into one super-continent

   

Balance between the weight of the continents and buoyant forces in the mantle

 

 

Question 5

1 / 1 pts

What provides some of the most compelling evidence for sea floor spreading?

  

The fact that each plate moves at a different rate

   

The differences between oceanic and continental crust

   

Alternating bands of reversed and normal magnetic polarity in the sea floor. 

   

Most continental shelves are submerged

 

 Information can be found  in section 3.10, The Confirmation of Plate Tectonics .

 

IncorrectQuestion 6

0 / 1 pts

Where is new sea floor being created?

  

Convergent plate boundaries

   

Divergent plate boundaries

   

Transform plate boundaries

 

 

Question 7

1 / 1 pts

A widely accepted theory that explains the origin of earthquakes, mountains, the sea floor, submarine trenches, hydrothermal vents, volcanoes and island archipelagoes, among other geologic phenomena, is known as:

  

Plate tectonics

   

Convergence

   

Seafloor spreading

   

Subduction

 

See Chapter 3 (Note: correct answer is plate tectonics. All the other terms listed here as possible options are related to the broader concept of plate tectonics but they each refer to one specific aspect of the overall theory)

 

Question 8

1 / 1 pts

How are P waves and S waves useful for scientists?

  

These waves help scientists to determine the nature of Earth's interior layers

  

They help scientists to determine the speed that different lithospheric plates move

   

Their reflection back to the surface helps us to form detailed images of the seafloor

   

They were originally used to help confirm the theory of continental drift and plate tectonics

 

 

Question 9

1 / 1 pts

What is a major source of Earth's internal heat?

  

Isostatic equilibrium

   

Conduction

   

Solar radiation

   

Convection

   

Radioactive decay

 

 

IncorrectQuestion 10

0 / 1 pts

How do seafloor sediments help confirm plate tectonics?

  

Sediments are thickest and oldest at mid-ocean ridges, and at trenches they are thinner and younger

   

Most seafloor sediments are dated nearly the same age as the oldest rocks on the continents

   

The young spreading ridges are almost free of sediments and the oldest sediments at the edges of ocean basins are rarely more than 180 million years old

   

Sediment is evenly distributed across all ocean basins no matter where a sample is taken

 

 

Question 11

1 / 1 pts

Which of these would have the LEAST amount of volcanic activity?

  

Divergent boundaries

   

Convergent boundaries between oceanic and continental plates

   

Convergent boundaries between two oceanic and plates

   

Transform boundaries

 

Chapter 3, Video

 

Question 12

1 / 1 pts

Where will you find trenches and sea floor destruction?

  

Divergent plate boundaries

   

Transform plate boundaries

   

Convergent plate boundaries

 

 

Question 13

1 / 1 pts

When two oceanic plates converge, what determines which plate will submerge?

  

The density of the crust

   

The temperature of the crust

   

The age of the crust

   

All of these

 

Information can be found in section 3.8, Plates Interact at Plate Boundaries.

 

Question 14

1 / 1 pts

What characteristic is associated with convergent plate boundaries?

  

New crust formation

   

 Solidification of crust materials

  

Spreading zones

  

Violent geological activity

 Information can be found in the section 3.8, Plates Interact at Plate Boundaries.

 

Question 15

1 / 1 pts

What type of plate boundary would create volcanic mountain chains on a continent (for example, the Andes mountains of South America)?

  

Transform plate boundaries

   

Convergent plate boundaries

   

Divergent plate boundaries

   

Passive plate boundary

 

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