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Inside our Earth What keeps the Earth’s tectonic plates in motion?

Dec 28, 2015

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Elwin James
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Page 1: Inside our Earth What keeps the Earth’s tectonic plates in motion?
Page 2: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Inside our Earth

What keeps the Earth’s tectonic plates in motion?

Page 3: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Inside our EarthLithosphere

~ The solid, ground part of our Earth;

measures roughly 62 miles thick and includes the

crust and the ocean floor.

Page 4: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Inside our EarthAsthenosphere

~ The layer just below the lithosphere and found in the upper mantle; made up of rock that is hot, soft, and

slightly fluid.

Page 5: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Inside our EarthConvection Current

~ the path along which energy is transferred through a liquid; heat rises, cools, heats up and rises again…thought to be the driving

force of continental drift in the asthenosphere.

Page 6: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Inside our EarthOther examples of convection currents…

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A feature that rises above the surrounding landscape. In most cases, mountains are created

from plate movement.

Page 10: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Four Basic Types:

• Folded

• Fault-Block

• Dome

• Volcano

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Folded Mountains

These mountains form when two tectonic plates collide

(Swiss Alps, Himalayas, Urals)

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Himalaya Mountains

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Alberta, Canada

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Sierra Nevada Range, California

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Fault-Block Mountains

These mountains form when masses of rock move up or down along a fault

(Wasatch Range in Utah)

Page 16: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Wasatch Range, Utah

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Franklin Mountains, Texas

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Dome Mountains

The surface is lifted up by magma, forming a bulge; the rock layers have worn away

exposing the other layers of rock.

(Pike’s Peak in Colorado, Big Horn)

Page 20: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Bighorn, North Dakota

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Castle Dome Mountains, Arizona

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Half Dome, Yosemite California

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Volcano

Form when magma erupts from an opening in Earth’s surface.

(Mt. St. Helens - USA, Mt. Fuji - Japan)

Page 24: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Mt. St. Helens

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Mt. Fuji

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Hawaii

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Hawaii

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PompeiiAugust 24, 79 AD, the sleeping town of

Pompeii, Italy was destroyed by a volcano…Mt. Vesuvius.

Page 30: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Mt. Vesuvius, Italy

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Pompeii

Page 32: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Pompeii

~ The city would remain buried for over 1700 years under several feet of ash, lava, and

rock that fell on the city.

~ The people who lived here never knew what hit them – the rock and ash

preserved their bodies in the position they last were in and it would not be until 1860 that the archaeologist, Giuseppe Fiorelli,

would be able to see their story…

Page 33: Inside our Earth What keeps the Earth’s tectonic plates in motion?

Pompeii

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