Warm-Up Find the mistakes! 1. During the 1940s and 1950s, scientists began using radar on moving ships to map large areas of the ocean floor in detail.

Warm-UpFind the mistakes!

Warm-UpFind the mistakes!

1. During the 1940s and 1950s, scientists began using radar on moving ships to map large areas of the ocean floor in detail.

2. The youngest rocks are found far from the mid-ocean ridges.

3. The scientist Harry Henry Hess invented echo-sounding devices for mapping the ocean floor.

4. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks.

5. Rocks on the seafloor are much older than many continental rocks.

1. During the 1940s and 1950s, scientists began using radar on moving ships to map large areas of the ocean floor in detail.

2. The youngest rocks are found far from the mid-ocean ridges.

3. The scientist Harry Henry Hess invented echo-sounding devices for mapping the ocean floor.

4. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks.

5. Rocks on the seafloor are much older than many continental rocks.

PLATETECTONICS

PLATETECTONICS

Theory of Plate TectonicsTheory of Plate Tectonics

Earth’s crust and part of the upper mantle are broken into sections.

These sections are called plates.

Plates move on the asthenosphere: a plastic-like layer of the mantle.

Earth’s crust and part of the upper mantle are broken into sections.

These sections are called plates.

Plates move on the asthenosphere: a plastic-like layer of the mantle.

Earth’s StructureEarth’s Structure

Earth’s Crust & MantleEarth’s Crust & MantlePlates are made up of the crust and a

part of the upper mantle:

Lithosphere- Rigid. Made up of crust and upper mantle. 0-100 km thick.

Asthenosphere- The plastic-like layer that lies below the lithosphere.

The plates of the lithosphere float on the asthenosphere.

Plates are made up of the crust and a part of the upper mantle:

Lithosphere- Rigid. Made up of crust and upper mantle. 0-100 km thick.

Asthenosphere- The plastic-like layer that lies below the lithosphere.

The plates of the lithosphere float on the asthenosphere.

DivergentDivergentPlates are

moving apart from each other

Creates new seafloor and expanding oceans

Plates are moving apart from each other

Creates new seafloor and expanding oceans

As continental plates separate, they create a rift valley

As oceanic plates separate and magma rises, ridges form

Mid Ocean RidgeMid Ocean Ridge

North American Plate

Eurasian Plate

South American Plate

African Plate

Convergent Convergent

Plates move together

There are two things that can happen at a convergent plate boundary…

Plates move together

There are two things that can happen at a convergent plate boundary…

Oceanic - ContinentalOceanic - Continental At sites where oceanic

and continental plates collide, subduction zones form.

At subduction zones, the more dense plate (oceanic) sinks beneath the less dense plate (continental).

At sites where oceanic and continental plates collide, subduction zones form.

At subduction zones, the more dense plate (oceanic) sinks beneath the less dense plate (continental). The sinking plate melts

and forms magma that rises to the surface through a volcano.

Mountains and deep sea trenches are also found at subduction zones.

The Andes Mountain Range is found in Chile.

The Andes Mountain Range is found in Chile.

The volcanism of the Andes Range is a result of the subduction of the Nazca Plate underneath the South American Plate.

Continental - ContinentalContinental - ContinentalAs continental plates collide, mountain

ranges are created.As continental plates collide, mountain

ranges are created.

The Himalayas are still forming as the Eurasian and Indian Plates collide.

The Himalayas are still forming as the Eurasian and Indian Plates collide.

TransformTransform

Plates slide past each other

As one plate slips past another suddenly, earthquakes occur.

Plates slide past each other

As one plate slips past another suddenly, earthquakes occur.

San Andreas FaultSan Andreas FaultLocated in

CaliforniaThe Pacific Plate

is sliding past the North American Plate

Located in California

The Pacific Plate is sliding past the North American Plate

On the split screen NotesOn the split screen Notes

Draw a picture of the Earth’s Layer- Label and explain a convection current

Draw a picture of the Earth’s Layer- Label and explain a convection current

Why Do The Plates Move?Why Do The Plates Move?The transfer of heat inside the Earth

provides the energy to move plates and, subsequently, many of Earth’s surface features.

Convection currents inside the mantle causes the movement of the plates

The transfer of heat inside the Earth provides the energy to move plates and, subsequently, many of Earth’s surface features.

Convection currents inside the mantle causes the movement of the plates

Convection CurrentsConvection Currents

The Earth’s hot, inner core heats the liquid mantle.

The magma closest to the core heats up, becomes less dense, and rises.

The magma at the top of the mantle cools, becomes more dense, and sinks.

The Earth’s hot, inner core heats the liquid mantle.

The magma closest to the core heats up, becomes less dense, and rises.

The magma at the top of the mantle cools, becomes more dense, and sinks.

Graphic organizer Graphic organizer

Create a three flap flip chart In the front of each flap write the name of a

type of boundary: Transform, Divergent, Convergent boundaries

Draw and color the boundaries on the inside of the front flap

Use your book and notes to write the following information under each flap: What happens at this type of boundary What types of geographic formations does it create Where in the world can this boundary be found

Create a three flap flip chart In the front of each flap write the name of a

type of boundary: Transform, Divergent, Convergent boundaries

Draw and color the boundaries on the inside of the front flap

Use your book and notes to write the following information under each flap: What happens at this type of boundary What types of geographic formations does it create Where in the world can this boundary be found