The process of covering the land with glaciers is called glaciation. Glaciers cause changes in the Earthâ€™s surface by reshaping the landscape, picking up rocks and soil, and eroding hills during glacier slide. There are five glaciation periods known in the Earthâ€™s history; they are Hunorian (2.4â€“2.1 billion years ago), Cryogenian (850â€“635 million years ago), Andreanâ€“Saharan (460â€“430 million years ago), Karoo (360â€“260 million years ago), and the most recent glaciation period (18,000 years ago). Glaciations are caused by astronomical cycles, geologic activity, and changes in the levels of greenhouse gases.
Tectonic Plate Movements:
The internal heat of the Earth causes the tectonic plates of the upper mantle to move toward or away from each other. This movement is called plate motion or a tectonic shift. About 250 million years ago, Earth had only one large continent called Pangaea, and one ocean called Panthalassa. The huge continent started breaking into smaller continents and started moving, thus forming modern continents.
The movement of tectonic plates causes earthquakes. When the tectonic plates move, their edges get stuck to each other due to friction. When friction is reduced, energy is released in the form of waves. These waves travel through the Earthâ€™s crust forming earthquakes. In 2010, the earthquake in the Indian Ocean caused a tsunami and resulted in the death of 300,000 humans.
Earthâ€™s core is so hot that it melts rocks and forms a thick flowing substance called magma. The density of magma is lighter than the solid rock around it, so magma rises and gets collected in the magma chambers. Depending upon the composition of the magma, volcanic eruptions can be explosive. If the magma is thick and sticky, the gas in the magma escapes violently causing an explosion. If the magma is thin, the gas escapes easily, and therefore the magma flows slowly from the volcanic vent without explosion.
Weathering breaks down or dissolves rock and minerals on the surface of the Earth by wind currents and storms. Broken rocks and minerals are carried away by water, air, and ice.
Erosion is a destructive phenomenon and they break down the existing geologic materials. The leaching of soil and land is the outcome of erosion. Natural forces such as wind, water, or ice transport the leached material. Dusty wind and muddy water indicate erosion. Bits of rock and soil suspended in the fluid and air are transported from one place to another during erosion. This transported material is called sediment.
The deposition of minerals or sediment builds up land forms and increases the fertility of the soil, thus increasing the biomass of the particular region.
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