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Presentation transcript:

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What percent of the Earth does the mantle take up?

80%

What elements are in the Earth’s inner core?

Iron and Nickel

How do tectonic plates move?

Float on top of the asthenosphere due to convection currents in the mantle

What happens at a subduction zone?

More dense oceanic plate dives beneath less dense continental plate

What do plates do at a transform boundary?

Slide past each other

How often do the Earth’s magnetic poles reverse?

Every 200,000 years

Energy travels in earthquakes as ________ _______

Seismic waves

Is a longitudinal wave a P wave or an S wave?

P wave

What type of wave can not travel through liquids?

Transverse or S waves

What does a seismograph measure?

Location of the epicenter of an earthquake

What does the Richter scale measure?

The amount of energy that an earthquake releases

What is seismology?

The study of earthquakes

What type of volcanoes have only violent explosions?

Cinder Cone

What is the Ring of Fire?

An area in the Pacific Ocean with frequent earthquake and volcanic activity

What are records of seismic activity called?

Seismograms

What type of fault is found at a transform boundary?

Strike-slip

What type of volcano is the steepest?

Composite

What type of volcano has only mild eruptions?

Sheild

Which layer of the Earth is the most dense?

The core

What scientist proposed the theory of continental drift?

Alfred Wegner

What layer of the Earth is the thinnest?

Crust

An earthquake starts at the ______ beneath the Earth’s surface.

Focus

Does an earthquake with a shallow focus or one with a deeper focus cause the most damage? Explain.

Shallow, the Earth absorbs some of the energy

What is the asthenosphere?

Liquid portion of the mantle