Earth has several layers.

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Presentation transcript:

Earth has several layers. Unit A Section 1.1

What is the age of the Earth? Scientists estimate the age of the Earth to be approximately 4.6 billion years old. They theorize that Earth began as a spinning mass of rock and dust. Explosions from comets and asteroids, along with intense gravity and pressure produced the heat to melt materials inside the Earth.

Temperature/Thickness Layer Composition Temperature/Thickness Inner Core Solid Metals 7,000- 8,000 ºC 2,400 km diameter Outer Core Liquid Metals 4,400- 6,100 ºC 2,300 km thick Mantle Heated Rock 870- 4,400 ºC 2,900 km thick Crust Cooler Rock 0-700 ºC 6-7 km thick 1- continental crust-thicker 2- oceanic crust- thinner

Earth’s crust + top layer mantle=lithosphere Lithosphere sits atop soft, hot rock layer (magma) in the mantle= asthenosphere. The lithosphere is made up of many plates- slabs of rock called tectonic plates, which fit together like a puzzle.

Discovery of Earth’s layers and tectonic plates led to new discoveries: - continental drift - sea floor spreading