EARTH LAYERS Seismic Waves Scientists know that the

Seismic Waves Scientists know that the Earth consists of layers ●this is known by

Earth Layers Four Major Layers 1. ) Crust – the thin, cool, rocky outer

Mantle 2. ) Mantle – ●Upper mantle is similar to the crust (mostly solid

The Core 3. ) Outer Core ● Hot and Liquid Flowing iron produces Earth’s

Lithosphere & Asthenosphere Lithosphere ● cool solid outer layer of Earth ►consists of crust

Mohorovicic Discontinuity ● The separation between the crust and the mantle ● Shortened to

Slides: 7

Download presentation

EARTH LAYERS

Seismic Waves Scientists know that the Earth consists of layers ●this is known by studying seismic waves ●if the Earth was not layered, seismic waves would travel straight through at constant speed… ●this is NOT the case

Earth Layers Four Major Layers 1. ) Crust – the thin, cool, rocky outer layer ●two types – Continental and Oceanic Thick (40 km) Old (up to 4 byo) Thin (7 km) Young (less than 180 myo)

Mantle 2. ) Mantle – ●Upper mantle is similar to the crust (mostly solid rock) ●Lower mantle is warm and soft ●magma rises and lowers, creating convection currents

The Core 3. ) Outer Core ● Hot and Liquid Flowing iron produces Earth’s magnetic field 4. ) Inner Core ● Hottest layer SOLID iron-nickel sphere Solid due to immense pressure

Lithosphere & Asthenosphere Lithosphere ● cool solid outer layer of Earth ►consists of crust and uppermost mantle Asthenosphere ● warm, soft and weak layer of Earth ►consists of the lower mantle

Mohorovicic Discontinuity ● The separation between the crust and the mantle ● Shortened to Moho ● Discovered in 1909 by seismologist Andrija Mohorovicic ● Discovered it by studying seismic waves