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During four-handed dentistry,the operator must have:
Aquifers
Underground layers of water-bearing permeable rock or materials through which groundwater can be extracted using a well.
Renewable Natural Resources
Things such as forests, water in reservoirs, and wildlife that are capable of growing back or building back up (renewing themselves) if they are harvested at moderate rates.
Natural Capital
The world's stock of natural resources, including geology, soils, air, water, and all living organisms, which provide goods and services that support the economy and life.
Nonrenewable Natural Resource
Things such as oil, natural gas, and metals, that are either in actual fixed supply or that renew so slowly as to be in virtual fixed supply when viewed from a human time perspective.
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