'Climatic variations' and 'Human activities' can be regarded as the two main causes of desertification. removal of the natural vegetation cover（by taking too much fuel wood）, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.
The typical time interval between sunrise and sunset will be 50 hours.
<h3>What is earth rotation?</h3>
The rotation of the planet Earth around its own axis and variations in the orientation of the rotation axis in space are referred to as Earth's orbit or Earth's spin. Earth rotates prograde in an easterly direction. The Earth rotates counterclockwise when viewed from the northern polar star Polaris. The Northern Hemisphere's North Pole, sometimes referred to as the Geographic North Pole or Terrestrial North Pole, is where the Earth's axis of rotation and surface meet. The North Magnetic Pole of the Earth is distinct from this place. The other location where the axis of rotation of Earth crosses the surface is the South Pole, which is located in Antarctica. The Earth revolves once every 24 hours or so in relation to the Sun, but only once every 23 hours, 56 minutes, and 4 seconds in relation to other far-off stars.
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<span>Geographic concepts are ideas which posit connections between humans in both natural and cultural settings, they are connected to space and proximity and offer geographers a lens in which to consider and present information that they conclude about the world. Based upon these conclusions that can be drawn from these concepts, geographic questions can be answered with evidence from how humans interact with the world.
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