Plate Tectonics and Seawater Composition

What is the primary driving force behind plate tectonics?

• Gravitational pull

• Convection currents in the asthenosphere

• Convection currents in the lithosphere

• Ocean currents

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DOK Level 1: Recall

Which element is most abundant in seawater by weight?

• Sodium

• Chlorine

• Magnesium

• Oxygen

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DOK Level 1: Recall

Identify the type of plate boundary where two plates move away from each other.

• Convergent boundary

• Divergent boundary

• Transform boundary

• Subduction zone

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DOK Level 1: Recall

What is the average salinity of ocean water?

• 1%

• 2%

• 3.5%

• 5%

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DOK Level 1: Recall

Describe the composition of oceanic crust.

• Primarily granite

• Primarily basalt

• Primarily sandstone

• Primarily limestone

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DOK Level 2: Skill/Concept

What is the main cause of volcanic activity at convergent plate boundaries?

• Subduction of an oceanic plate beneath a continental plate

• Divergence of two oceanic plates

• Transform faulting between two plates

• Mantle plumes

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DOK Level 1: Recall

Which process is responsible for the recycling of oceanic crust?

• Seafloor spreading

• Subduction

• Mantle convection

• Continental drift

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DOK Level 1: Recall

Analyze the impact of tectonic plate movements on ocean water composition.

• Tectonic plate movements can lead to the mixing of different water masses, affecting salinity and temperature.

• Tectonic plate movements have no impact on ocean water composition.

• Tectonic plate movements only affect the ocean floor, not the water composition.

• Tectonic plate movements decrease the salinity of ocean water.

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DOK Level 3: Strategic Thinking

What is the primary cause of earthquakes at transform plate boundaries?

• Subduction of an oceanic plate

• Sliding of two plates past each other

• Formation of new crust

• Melting of the mantle

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DOK Level 1: Recall

Which element is the second most abundant in seawater by weight?

• Sodium

• Chlorine

• Magnesium

• Sulfate

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DOK Level 1: Recall