Theory of Plate Tectonics

Based on the diagram, which process explains why less dense, hot magma rises to the surface to displace more dense, cooler magma?

• Conduction

• Diffusion

• Radiation

• Convection

Which of these describes divergent boundary?

• Two Continental plates moving away from each other, forming a rift valley

• Two oceanic plates rubbing against each other, forming a mid-ocean ridge

• Two Continental plates colliding, forming a mountain rainge

• Two oceanic plates colliding, forming a volcanic arc

The Mid-Atlantic Ridge exists between the African and South American geologic plates. Which process most often occurs at the Mid-Atlantic Ridge?

• destruction of underwater mountains

• Creation of new continents

• subduction of geologic plates

• spreading of sea floor

Which feature is associated with the letter L?

• Mid-Ocean Ridge

• Trench

• Continental Plate

• Subducting Plate

Which feature is associated with the letter O?

• Mid-Ocean Ridge

• Trench

• Continental Plate

• Subducting Plate

Tags

NGSS.MS-ESS2-3

Which feature is associated with the letter M?

• Mid-Ocean Ridge

• Trench

• Continental Plate

• Subducting Plate

Tags

NGSS.MS-ESS2-3

A rift valley is evidence of which kind of plate boundary?

• convergent

• divergent

• transform

• uniform

Alfred Wegner's Theory of Continental Drift was not well accepted because he couldn't say what force could be big enough to move continents. Current theories explain this movement with

• subduction zones at Continental margins

• hot spots forming under continents

• magnetic reversals of the north and south poles

• convection currents in the mantle

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-3

The theory of plate tectonics states:

• Earth's lithosphere is broken into many pieces called tectonic plates that move slowly over the asthenosphere.

• Earth's asthenosphere is broken into many pieces called tectonic plates that move slowly over the lithosphere.

• Earth's inner core is broken into many pieces called tectonic plates that move slowly over the outer core.

• Earth's mantle is broken into many pieces called convection currents that allow heat to travel through the Earth.

Tags

NGSS.MS-ESS2-3

In a divergent boundary, plates pull away from each other. This allows cracks to form in the lithosphere. Melted rock can rise through these cracks. When the melted rock cools and hardens, it

• becomes new lithosphere.

• becomes a mountain range.

• sinks back into the mantle.

• freezes.

Tags

NGSS.MS-ESS2-2