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.
One of the most common forms of weathering in areas that have frequent freeze/thaw cycles is ice wedging.
The Country which is surrounded by water on all sides are known as "Islands" and there could be many examples like: "Britain, Ireland" etc..
Hope this helps!
A thermometer, a barometer, a sling psychrometer, and a rain guage
Peristalsis is the physical movement or pushing of food along the digestive tract.
