Waht is the age of Godwana Land?
Examples of lithospheric plates: Pacific plate, African plate, Indian plate, South American plate, Australian plate, Antarctic plate
Earth's structure: Crust, Mantle, Core
The crust is the outermost layer of the earth's structure.
The core is the innermost layer of the earth's structure.
Lithosphere is the name given to the surface area of the earth's structure that contains the crust and the solid mantle.
Asthenosphere is the name given to the part of the upper mantle that lies just below the lithosphere.
Earth's crust is made up of Continental crust and Oceanic crust.
Continental crust is thicker than oceanic crust.
Continental crust - Approximately 30 - 60 km thick
Mantle - Approximately 2900 - 3000 km thick
Outer core - Approximately 2300 km thick
Inner core - Approximately 1200 km thick
The core is predominantly made up of nickel and iron.
Scientific studies show that the earth's magnetic field fluctuates over time.
Mid-Atlantic Ridge is the name given to the geological structure that extends from north to south in the middle of the Atlantic ocean.
Hotspots form in the mantle.
When a hotspot reaches the earth's crust a rift valley is often formed. Example: African rift valley.
The Mariana Trench was formed at convergent plate boundaries under the Pacific ocean and the Himalayan mountains were formed at convergent plate boundaries between the Indian plate and the Eurasian plate.
Geologists speculate that there are convection currents in the asthenosphere that cause the movement of continental and oceanic plates.
Pangaea is the name given to the large landmass that existed approximately 250 millions of years ago.
Fossils provide evidence that a large landmass existed approximately 250 millions of years ago.
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