The height of a land surface above the level of the sea

elevation

Explanation: The height above sea level of a point on Earth's surface is its elevation. The difference in elevation between the highest and lowest parts of an area is its relief.

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Explanation:

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true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.