Question 1

Geologists in the early 1900s concluded that heat flow through continents should be greater than heat flow through ocean floors. Evaluate this hypothesis.

Accepted Answer

A)  True. The granite of the continental crust contains more radioactive elements than the basalt of the ocean floor, so more heat is produced in continental crust. 
B)  True. Continental crust is thicker than ocean crust, so more heat is produced in the thicker layer. 
C)  False. The lithosphere is thinner beneath oceans than continents, so heat flows more easily up from the mantle. 
D)  False. The basalt of the ocean floor has a better insulating quality than continental crust granite. 
A)  True. The granite of the continental crust contains more radioactive elements than the basalt of the ocean floor, so more heat is produced in continental crust. 
B)  True. Continental crust is thicker than ocean crust, so more heat is produced in the thicker layer. 
C)  False. The lithosphere is thinner beneath oceans than continents, so heat flows more easily up from the mantle. 
D)  False. The basalt of the ocean floor has a better insulating quality than continental crust granite.

Question 2

Low viscosity does not favor convection.

Accepted Answer

A) True 
 B)False

Geologists in the early 1900s concluded that heat flow through continents should be greater than heat flow through ocean floors. Evaluate this hypothesis.

Low viscosity does not favor convection.

Why Study Earth

Minerals: Building Blocks of the Planet

Rocks and Rock-Forming Processes

Formation of Magma and Igneous Rocks

Formation of Sediment and Sedimentary Rocks

Formation of Metamorphic Rocks

Earth Materials As Time Keepers

Earth Materials As Time Keepers

Making Earth

Deformation of Rocks

Global Tectonics: Plates and Plumes

Tectonics and Surface Relief

Soil Formation and Landscape Stability

Mass Movements: Landscapes in Motion

Streams: Flowing Water Shapes the Landscape

Water Flowing Underground

Glaciers: Cold-Climate Sculptors of Continents

Shorelines: Changing Landscapes Where Land Meets Sea

Wind: a Global Geologic Process

Global Warming: Real Time Change in the Earth System

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Exam 10: Motion Inside Earth

Geologists in the early 1900s concluded that heat flow through continents should be greater than heat flow through ocean floors. Evaluate this hypothesis.

Low viscosity does not favor convection.

Why Study Earth

Minerals: Building Blocks of the Planet

Rocks and Rock-Forming Processes

Formation of Magma and Igneous Rocks

Formation of Sediment and Sedimentary Rocks

Formation of Metamorphic Rocks

Earth Materials As Time Keepers

Earth Materials As Time Keepers

Making Earth

Deformation of Rocks

Global Tectonics: Plates and Plumes

Tectonics and Surface Relief

Soil Formation and Landscape Stability

Mass Movements: Landscapes in Motion

Streams: Flowing Water Shapes the Landscape

Water Flowing Underground

Glaciers: Cold-Climate Sculptors of Continents

Shorelines: Changing Landscapes Where Land Meets Sea

Wind: a Global Geologic Process

Global Warming: Real Time Change in the Earth System

Filters