Why the thickness of the crust os variable?
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Below the crust is the mantle, a dense, hot layer of semi-solid rock approximately 2,900 km thick. The mantle, which contains more iron, magnesium, and calcium than thecrust, is hotter and denser because temperature and pressure inside the Earth increase with depth.
Below the crust is the mantle, a dense, hot layer of semi-solid rock approximately 2,900 km thick. The mantle, which contains more iron, magnesium, and calcium than thecrust, is hotter and denser because temperature and pressure inside the Earth increase with depth.
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" Mantle "
Below the crust lies the mantle. It extends upto a depth of 2900 km. Its chief constituent are silicates of iron and magnesium. Both the temperature and the density of the mental increase with increasing the depth towards the centre of the earth.
The thickness varies becuse of melted solid inside them.
Below the crust lies the mantle. It extends upto a depth of 2900 km. Its chief constituent are silicates of iron and magnesium. Both the temperature and the density of the mental increase with increasing the depth towards the centre of the earth.
The thickness varies becuse of melted solid inside them.
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