The Crust The crust is the outermost layer of the Earth. It is the thinnest layer of the Earth Two types of crusts Continental Oceanic View slide
Continental Crust Made of light substances Silicon Si Oxygen O Aluminum Al View slide
Oceanic Crust Contains heavy substances Iron Fe Calcium Ca Magnesium Mg Because it contains heavier substances it is denser than the continental crust.
The Mantle The mantle is the layer of the Earth between the crust and the core. The mantle is very thick Contains most of the Earth’s mass No one has really seen what the mantle looks like. The Ocean floor gives us many clues about the mantle Underwater Volcanoes
The Core The core is the layer that begins at the bottom of the mantle and ends at the center of the Earth. The core is made mostly of Iron There is a Inner and Outer Core
Inner and Outer Core The outer core is the liquid layer of the earth’s core. The inner core is the solid, and dense center of the planet.
The Physical Layers of the Earth Lithosphere Greek for “Rock Sphere” Divided into pieces called tectonic plates Made up of the crust and the rigid upper part of the mantle. Asthenosphere Greek for “Weak Sphere” Lies between the Lithosphere and Mesosphere Made of solid rock Mesosphere Greek for “Middle Sphere” Lies between the Asthenosphere and the Earth’s Core
Earth’s Physical Layers
Temperature and Pressure increase as you move towards the center of the Earth. Plasticity is a solid that has the ability to flow. Convection currents are hot material that becomes less dense and rises while cooler material becomes denser and sinks. This occurs in mantle layer of the Earth.
Mapping the Earth’s Interior Scientist use Earthquakes to find out information about the interior of the earth Seismic waves are vibrations produced by earthquakes The waves traveling speed determines the Earth’s density. Seismographs are used to measure the travel times of the waves