What is a Subduction zone?

When an oceanic plate moves under a continental plate

When two plates slide by each other

When two plates move away from each other.

When a continental plate moves under an oceanic plate.

What is the process that is thought to move the tectonic plates?

tidal forces from the Sun and Moon

Layer where oceanic and continental crusts are found

Layer where very hot rock rises and falls

Wegener used the following evidence to prove his theory of continental drift?

Similar fossils found on separate continents

Rocks found on separate continents

Oceanic crust subducts under continental crusts because

Continental crust is more dense

Oceanic crust and continental crust is the same

When looking at mid ocean ridges the oldest rocks are

Found far from the mid ocean ridges

The YOUNGEST seafloor is located?

Farthest from the mid-ocean ridge

How did scientists use the magnetic polarity of the Earth's crust to prove the theory of seafloor spreading? (Rocks in Earth's crust show permanent evidence of Earth's polarity at a given time.)

They showed that the patterns of polarity in Earth's crust on one side of a mid-ocean ridge mirrored the other side.

They were able to reverse the polarity of crust samples using an electromagnet.

They showed that the polarity of Earth's crust was different on each side of the mid-ocean ridge.

They used a magnetometer to change the magnetic signature of rocks on either side of the mid-ocean ridge.

What evidence further supports the theory of seafloor spreading? (The crust near the mid-ocean ridge younger than the crust far from the mid-ocean ridge.)

Sediment is older and thinner farther from the mid-ocean ridge.

Thermal energy is higher under the abyssal plain.

Thermal energy is higher over the abyssal plain than close to the mid-ocean ridge.

Sediment is very thick at the mid-ocean ridge.

What happens to the molten rock when it hits the Earth's surface from the mid-ocean ridge?

The lava will solidify, becoming part of the seafloor

The lava will spill out onto the land, burning everything in its path

The lava will damage the water molecules in the ocean, making the seafloor inhabital

The lava will solidify and block any new lava from reaching the Earth's surface

Where is the oldest rock going to be located on the seafloor?

Furthest away from the mid-ocean ridge

Basalt that is closest to the mantle

How can scientists know what kind of polarity the Earth was in at any given time?

Scientists can use magnetic signatures in rocks and determine their age

Scientists can guess based on how long it takes for magnetic reversal to happen

Scientists can use a compass to determine polarity presently

Scientists are not able to determine this information

Convection currents in the Earth's mantle are caused by

Less dense hot magma moving upward

Less dense hot magma moving downward

More dense cooler magma moving upward

Convection is occurring in the earth because there is

A temperature and density difference in the earth

No temperature or density difference in the earth

Plate Tectonics Seafloor Spreading

6th Grade - University

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47 Qs

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Practice Problem

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Hard

Charles Martinez

FREE Resource

47 questions

Show all answers

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is this a picture of?

plate tectonics

continental drift

pangea

glacier scaring

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The Theory of Continental Drift states that Pangaea broke apart and the continents "drifted" away from each other

True

False

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What does the theory of continental drift state?

The continents were once joined in a super-continent and have moved over time

Continents are stationary and do not move

The Earth is broken into lithospheric plates that move due to convection currents

none of the above

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Name the boundary

convergent boundary

divergent boundary

transform boundary

sergent boundary

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Name the boundary

convergent boundary

divergent boundary

transform boundary

sergent boundary

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A collision between two pieces of continental crust at a converging boundary produces a

mid ocean ridge

deep ocean trench

rift valley

mountain range

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

An underwater mountain chain caused by a divergent boundary, where new ocean floor is formed.

mid ocean ridge

volcano

rift valley

trench

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Plate Tectonics Seafloor Spreading

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What is this a picture of?

The Theory of Continental Drift states that Pangaea broke apart and the continents "drifted" away from each other

What does the theory of continental drift state?

Name the boundary

Name the boundary

A collision between two pieces of continental crust at a converging boundary produces a

An underwater mountain chain caused by a divergent boundary, where new ocean floor is formed.

A collision between a continental crust and an oceanic crust at a converging boundary produces a

What are the two types of crust

Which layer has convection currents?

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