Valence electrons, then, are electrons in the outermost shell of the atom that determine an atom's or group's ability to bond with others. In chemistry, a group refers to two or more atoms that are specifically arranged.
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It occurs when and where there is not enough water to meet both demands and those of ecosystems to function effectively.
Friction and Tectonic
Chemical Weathering
Physical Weathering
Wind and Water Erosion
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Hydroelectric energy
Explanation:
In a dam area, the most likely energy resource would be an hydro-electric energy source.
Here the dammed water is used to produce electricity by forcing turbines to rotate.
- Hydroelectric power stations are sited near huge water bodies especially a dam.
- The moving water is used to drive heavy turbines that been designed to move electricity.
- An area with huge amount of water has immense potential to generate hydroelectric power.
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Answer:
<u><em>River valley civilizations</em></u>
Explanation:
They were centred around various river valleys as their main source of livelihood and the flourished only due tiote river valley on which they were based. Like the harappan in Indus Valley, The yellow river (Huang He), the Mesopotamia around Tigris and Euphrates and the egyptian Nile.