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.
Answer:
Natural elements such as metals, wood, and recourses such as H20,C02,and o2.
Iron, copper, and aluminum are 3 metals that are commonly used in todays economy.
Copernicus was also one of the scientists who tried to explain the laws of nature and the universe. I hope this helped, sweetie.
<span>because a thick mass of ice that originates on land from the accumulation, compaction, and recrystallization of excess snowfall
(land base features)
(highly viscous fluid)
(Glaciers develop and advance over significant time periods more winter snow falls on land that melts in summer)</span>