All About Earth (Core to Crust; Includes Facts; Q/A & much more) Arnold_Anand
This presentation is made in power point 2016.with lots of exciting transitions and animation. With loads of information and pictures.Helpful for students in classes 8,9,10 in social studies (SSC syllabus)
All About Earth (Core to Crust; Includes Facts; Q/A & much more) Arnold_Anand
This presentation is made in power point 2016.with lots of exciting transitions and animation. With loads of information and pictures.Helpful for students in classes 8,9,10 in social studies (SSC syllabus)
Internal Structure of The Earth
Physical Layering
Determining the Earth's Internal Structure
C. The Earth's Internal Layered Structure and Composition
D. VELOCITY AND DENSITY VARIATION WITHIN THE EARTH
The immense amount of heat energy released from gravitational energy and from the decay of radioactive elements melted the entire planet, and it is still cooling off today. Denser materials like iron (Fe) sank into the core of the Earth, while lighter silicates (Si), other oxygen (O) compounds, and water rose near the surface.
The earth is divided into four main layers: the inner core, outer core, mantle, and crust. The core is composed mostly of iron (Fe) and is so hot that the outer core is molten, with about 10% sulphur (S). The inner core is under such extreme pressure that it remains solid. Most of the Earth's mass is in the mantle, which is composed of iron (Fe), magnesium (Mg), aluminum (Al), silicon (Si), and oxygen (O) silicate compounds. At over 1000 degrees C, the mantle is solid but can deform slowly in a plastic manner. The crust is much thinner than any of the other layers, and is composed of the least dense potassium (K), calcium (Ca) and sodium (Na) aluminum-silicate minerals. Being relatively cold, the crust is rocky and brittle, so it can fracture in earthquakes.
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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2. Earth’s Interior
• Geologists have only been able to drill to 3.8
kilometers.
• The center of the Earth is more than 6,000
kilometers deep.
Since Geologists cannot observe the Earth’s
interior directly, they must rely on indirect
measures.
• Seismic Waves are recorded and study how they
travel through the medium of the Earth.
•This information has shown that the Earth has
several layers.
3.
4. Crust
Crust: the layer of rock that
forms Earth’s outer skin.
• The crust includes rocks,
mountains, soil, and water.
• The outer rind of rock is
much thinner than what is
beneath it.
• The crust includes both dry land and the ocean floor.
• It is thinnest beneath the ocean and thickest under
mountains.
•The crust can range from 5-40 kilometers.
•Oceanic crust is made up of basalt.
•Continental crust is made up of granite.
5. Mantle
The mantle is a layer of hot rock that extends nearly 3,000
kilometers deep.
• The Lithosphere is the upper portion of the mantle and the
crust.
• It is approximately 100 kilometers deep and floats on top
of the Asthenosphere .
•The Asthenosphere is a soft layer of the mantle.
•This layer flows slowly.
•The Asthenosphere is approximately 350 kilometers deep.
•The Mesosphere is the solid lower part of the mantle
below the Asthenosphere .
6. Earth’s Magnetic Field
• Currents in the liquid outer core force
the solid inner core to spin (planet w/in
another).
•The inner core spins slightly faster
than the rest of the planet.
•This movement creates the Earth’s
magnetic field.
